1) The same foot print, or less, than that of Windows 7.
2) The back-end optimizations that Windows 8 introduced.
3) 3 Variants. Home/low-end, Professional, and ARM.
4) The ARM and Home/low-end variants have metro on by default, but it can be turned off. The professional having metro off by default but having the ability to enable it.
5) Document/MS program sync between all three variants of Windows.
6) 64 bit only on the Home/low-end and Professional variants (64 bit ARM being a bit too far forward looking).
7) Death to the MS store. They just went about it wrong. Killing it, letting it cool, then reintroducing it after some huge changes could see it actually be viable.
8) Respect for the community. When you're pushing out directx variants to attempt to force consumers to buy a new version of windows you've failed. Admitting the failure would have gone a long way to getting support for 8.1. Instead we've got a blunt refusal from MS to admit to anything wrong. If the same thing happens with a new Windows it's likely that 7 will have the same extended legacy that XP did.
9) Integration of the Xbox needs to stop. The Xbox 360 showed it had the ability to be a media streamer. That is a good thing, but I buy a video game console for different reasons than I buy a desktop. The sooner MS stops trying to marry the two, the sooner they can make both truly great.
10) Reasonable pricing. Nobody likes to spend $300 on a retail copy of an OS. The OEM channel brings the price down more, but that's a single install. When you're looking at the OS as a more substantial part of the budget than the motherboard (low cost PCs often find themselves in this uncomfortable niche) you're hard pressed to not look at OS piracy. If an OS could offer OEM pricing, with multiple installs (to the same device), it would be far more reasonable. Windows 8 seemed to hit on this, but not accurately enough for my tastes.
Now, what do I expect? I see the windows OS meeting the Xbox OS. I see one confused and cludgy monster being born from this nightmare. The thing that really bothers me is that this kind of black hole cannot be moved away from, because MS is taking cues from Apple about homogenization. Apple might have a unified user interface, but they have a niche user market for it. Hopefully MS realizes that some diversity is needed, before they take what remains of their brand and bleach out all of the things that make it special.