For starters no one would want say Photoshop on their Tablet.
Why not? One might be able to use it as a drawing pad instead of a Wacom tablet or similar? Obviously you wouldn't want to do the touching up, effects, etc via touch but why carry around a second tablet if you don't have to?
The idea is that developers create apps for them just like they do for Ipad. You don't see Mac apps working on ipad, same difference, MS is just trying to make a single OS that can function on all the hardware varieties. its assumed then that development is now 2 sided for the same OS. those for tablets in mind and those for full desktops in mind except likely the desktop apps wont' work on the tablet i'd assume.
How well it does compared to Ipad only time will tell, for now i prefer ipad but we'll see what the development comunity and OEM's can do with W8 on a tablet.
Then the whole "one OS" thing is bunk as you're still developing for two totally different platforms, like with iOS and OS X. The only reason I would want Windows on a tablet is to have access to Windows apps on occasion, without that I see no advantage over iOS or Android.
it already has. didnt you see my desktop pics? they function much the same way. the screen doesnt slide to another but yeah, no doubt a more robust shell will be made after W8's release. But even the shell on my w7, i liked it pretty well. i just wish i could hide it quickly if i want to see the desktop or whatever.
Yes, which is the point. The UI can be done with what's already available in Win7 or earlier. Win8 is only needed for ARM support, certain drivers, etc and that could likely be handled by OEMs if they wanted to devote the time.