On 8 the lack of being to toss DX 9 along with 11 will see the elimination of far more older game titles far newer then the few I still run on 7! As long I run the 10.4 and nothing newer so far one old title will run without DX 9 since Direct X 7 was an option seen with the installer there. The ATI/AMD updated Cat.s then became the problem.
No need to worry on this one:
I didn't installed directx 9 yet and some oldies work without problems.
There are games made back in 97 like
Dune 2000 and
Starcraft I and work
prefectly Win8. They require directx 5.
I don't know if some of you know Dune 2000 but it works like back in 98 again (with 98 compatibility of course) and on Win 7 that's not the case:
It's an RTS game like Red Alert 1 and it seems there is some sort of directx effect they used to shake the screen when someone's building(s) get destroyed. Well that effect doesn't work on XP (only on some VM's) nor in Vista nor in Win7 it's confirmed. But surprisingly it works on Win8.
The Compatibility Mode in Win8 is improved, I can say that without doubts.
Running Dune 2000 on Win7 without compatibility mode works (runs the same with 98 comaptibility).
On Win 8 you got to set Win98 compatibility for it to work (but then runs like in 98).
You got Moto Racer (97 again) that needs 16bit screen resolution: right click on the main exe -> 16bit compatibility (exists only on Win8 interface) and compatibility mode: Win98, and yes it works better than in Win7 (runs I think too fast on newer CPU' so watch out)
Then you also have Age Of Empires II: you can see what I mean here
http://www.eightforums.com/gaming/2593-windows-8-age-empires.html
This on is newer than Dune 2000 or Starcraft but it didn' t run well enough in Win7: you had those bad colors all over the screen.
And you know what I'm gonna say now: that it works on Win8: BUT wait until you get on the gameplay windows because the menu's still don't look that good.
There may be other classic releases that might also work. But after those tests with some om my classics I think Win8 does a very good job, beating Win7 on this kind of test.
All looks good.