I upgraded to win8 for 2 reasons.
1) upgrade from home to pro for $40 is a relative steal
2) I love some of the power user options built into win8 so that I do not have to rely on old/unsupported 3rd party software to get some neat features (specifically the multi-screen desktop options, and native image mounting for VHD/CDs, but others as well)
Truth be told, the new UI does not bother me much, and I even enjoy using it from time to time, but am glad that it sets out of the way unless wanted.
Anywho. I also picked up a lumia 920 a few weeks ago, and here are some of the things I would like to see move between the 2 platforms;
1) App portability. If it is on my phone, then it ought to be available on my PC, and make an option to automate this process. I understand it not working the other way around, but everything in WP8 ought to work in Win8 as well.
2) If I have syncing turned on with my liveID acct in win8 then when I change options on the PC (such as a color scheme) then it ought to change it on the phone also (and vice versa).
3) My phone should be my touch interface for the PC. The smartglass idea is a good idea for xbox... and an even better idea for the desktop. I don't want to touch my monitor of my desktop, but I will touch my phone all day. For most things keys and mice are simply better, but for some options touch could be nice. As an extenstion of #2, let's make the phone be the start screen for the desktop! When you enter into smartglass for your PC it should move all of the UI to the phone (start screen, charms, settings bar, top/bottom option bars, program switching, etc, and then treat the desktop display as... well a display, showing your app or desktop without interruption.
4) (and this will not happen) some sort of desktop emulation on the phone. I dont care if it is remoting in, or emulating, or what, but there are some instances when on the go that I would like to have access to some aspect to my desktop. Tieing the feature to similar versions of the phone and PC OSs would ensure that I keep my desktop up to date every 2 years when I get a new phone.
5) NFC for the PC. My wife and I use NFC all the time now to xfer pics between our phones and I would love to be able to have an upright dock which has an NFC tag and wireless charging. When I plop the phone down on the dock it automagically starts syncing the new pics and media from the phone to the desktop, while the desktop charges the phone.
6) (another one that will not happen) Better voice control for the PC! I demand this! While not always appropriate, I love the idea of being able to tell my computer to do stuff verbally. But this crap control provided by the winXP style voice navigation is not the way to do it. WP7/8 proves that MS has some really good voice recognition software, so lets take it a step further and integrate it into everything! Just like google search has a voice input option, lets add voice input for just about anything.
Taking it a step further, lets make a recognition engine that can understand complex language. The phone may not have enough horsepower to do this in a timely fashion, but my desktop has 8 cores that spend most of their time waiting for something to do. I ought to be able to say things like "open Netflix" and have the PC understand that I need it to launch my browser, and go to netflix's website. Or to say "Continue watching Bones" and it ought to know what bones is (a TV series), what outlet I like to watch it on (netflix, or an AVI, or the Fox website, or some other medium), and be able to pick up where I left off on it. I do not expect the computer to know what I am talking about the first time I say the command, but as I use the computer I would like for it to know what I do (without reporting my activities to anyone), how I do it, and begin to recognize things based on my habits. Like any good doss command it should have a really good default, and then a slew of addendums that can be added if the user want to
This is the Future dammit! And I want Stark's computer!
7) More integration between Apps. While I found it dizying at first, I have really come to love how WP8 moves between apps. You can go from a contact, to a FB conversation, to a web link, to youtube very fluidly. Each step is a link from unrelated media, and yet it flows seamlessly. Some bits (like FB chat) works within the WP8 chat client, but when a link is posted it immediately takes you to the site, and if the site requires PDF or youtube viewer, then it automatically moves to that without hesitation. Win8 does this a little bit in metro, but I would like to see more of it.
8) (another thing that will not happen), windowed apps for the x86 versions of win8. Snap works just fine on a tablet... but it is not so great for a desktop with a large screen. My screen is 1920x1200 (and I hope to have a bigger one soon), apps require a minimum of 1024x768 to run... so lets let apps have an option to run in a 1024x768 window on the desktop! Especially games! There is no need to run solitaire or minesweeper full screen, and snapped it becomes unplayable even on my big screen, so there is no good way for me to play cards while watching a show. It is hardly a 'dealbreaker' issue... but come on! If you have a large or high resolution screen metro makes less and less sense. I completely understand the move towards metro, and am hardly against it, but let's add an element of common sense and flexibility to the new interface.
9) adjustable snap positions. The default ones kinda stink. At least give me 25, 33, 50, 66, and 75% snap points, but a fluid user defined snap point is what I really want.