The only "hot key" come that I miss from Win 7 is that I used to tap the windows key arrow over and press enter to shut the machine down. Arrow up or down if I wanted to log off or restart. That isn't really a hot key though...and now days I just reach over press my power switch instead.
I think all of the hot keys are still the same...but now there there are a bunch of new ones and of course the Aero related ones are gone.
Win key + number will still launch your pinned applications
Win key + R still opens Run
Win key + D still goes to desktop (but not from the start screen)
Win key + E still opens Windows Explorer (or whatever they call it now)
I could go on and on...I can't think of any that I've seen missing.
My one and only complaint on Win8 is that if you go looking for a rarely used application, that you don't know the name of, you have to use the "All Apps Screen". Which is this horrific mess that might resemble what you would get if you expanded every folder in the start menu and plastered it across the screen with no option to collapse any thing. Applications are still organized by what the top level folder in the Start Menu would have been, but all the sub menus are just mashed together. It isn't too big of a deal for my personal use, but if I work from home I have to use a VM of Win7 I setup for work purposes because it is just a pain. Had they just made that all apps screen collapsible with sub menus...it would have been actually useful and the OS pretty much perfect in my opinion...though I never do anything with the "Metro" Start Screen besides when I tap the Win key to search for something and for that it works fine.
Yeah agreed on the bolded.
I think that's about the only complaint I have about Win 8.1...if MS found a way to make the All Apps screen much tidier it would be a huge improvement.