I just hope it's not going for the eye candy in such a way that you can talk to the computer, and have a face on the screen responding to you like you're talking to a human.
There would be too many unnecessary calculations done, requires too much power (in powersavings) and too much horsepower for simple tasks such as 'opening and reading a mail', or browsing online or so...
I hope the next windows will boot fast, will update well, will be very responsive, and have extremely low latencies in audio and graphics.
That the threading issue of CPU's will be ironed out, as well as defrag and prefetch issues that over time more slow down the harddrive than boost it.
I also hope that SSD issues will be ironed out; that it will have a library of generic drivers for older hardware to function, but that it does not need to store every driver of printer or USB device on the harddisk.
Also that it can easily improve performance by disabling automatic tasks like indexing, rollback drivers, etc...
I also hope it gets rid of the swap file, as more and more computers have plenty of RAM, if used appropriately, it does not need a swap drive.
winXP ran on 512MB RAM with 512MB swap file pretty fine. With this we could say it would be only normal that it could run on 1GB of RAM too, without forcefully adding a SWP file on the root of the drive.
That on harddrives Windows would recognize the inner tracks and the outer tracks and tries to focus large files (CAB, RAR, ZIP, Z7, ISO, AVI, MKV, ...) to the inner rim, while forcing some kind of name oriented directory structure on the outter rim, with the windows and most booted program directories on the outside of the rim.
That it would learn not to virus scan or defrag (or Index, or rollback) every week, and especially not when playing a game, or running the laptop on battery!
those are about the only issues I have with current windows versions.
I'm less into how Windows looks, and more into a well performing one, than reverse.
I can compare it to those "Yo-Yo" guys on the streets driving ridiculous cars with chrome and everything on their car, but inside have a meager 75HP engine. Then I'd rather drive a porche which looks quite regular but can outperform two of their nissan or BMWs, than drive a ridiculous car with bullethole stickers and exaggerated spoilers mounted.