I want them to get the basics right, with a few personal recommendations
New icons
Consistent look across the entire operating systems
Pet hates of mine with Windows 8
From the start screen press the down arrow at the bottom to see a list of all your apps. It looks dreadful. How is that good looking, or even productive? Say you install some software which has 10 applications. You know you want to run one of them, but can't remember the name. Good look finding it quickly.
With the old start menu at least they were in groups, not a flat system
The icons on the start screen. Look at notepad, it's the old notepad icon stuck in a coloured square box

come on ms! fire your design team and get people in who know how to make it look sexy
Release updated iso images!!!!!! why is it so complicated actually getting and installing a copy of windows 8 these days? I have a paid licence key, but can't for the life of me find an updated image. I have to install the basic windows 8, and spend hours installing update after update after update! and when windows says it's fully updated.....it's not, cause then you have a load of seperate updates to do from the app store LOL
two internet explorers, the desktop one and the metro one!! WHAT! lol
If I log in using a cloud connected account to sync the profile, where is it in the online world?
Apple let you download the latest image, or even do an internet installation!
I really don't like the idea of having metro apps running in a window on the desktop. It still feels to me like it's two operating systems competing against each other.
Apple are light years ahead which is a shame, as I much prefer the windows explorer shell over os x