The only reason I'd want a 64 bit version would be to build a stupid fast server with more than 4gb's of ram, simply because it's cheaper than you'd think.
Auto update installed and restarted my server last night, scared the crap out of me...browsing pictures then BAM, not available, cannot connect. Scares me when that happens. Anyway, I could see a couple different looks on the console, good couple of improvements, but not much.
I'm ready for version 2, because this one is working very very well. I'm pleased with the access options I currently have. In the house, 1 desktop, 1 laptop, xbox 360, ps3 and the home server, all sync up with no issues. I can also then access everything from the web, totally worth it!