The jury is still out on Aero Glass though IIRC. Glass is a step up and DX10 may be required for some of the advance functions with things such as font rendering.
Here is a hacked up version of my notes (WinHEC 2004) on the subject:
Text will be higher quality using HW accel. More typographic features are exposed ? ligatures, kerning, swash alternatives
Glyph rendering will be done at the subpixel level using knowledge of the RGB positions in the display.
Cleartype (current) is 17% better at word accuracy on speed reading.
Showed a demo of a text with a reflection that scaled much larger without aliasing.
DirectX 10 will cover the complete render of a font from composite/filter/blend/render in hw.
DirectX 9 will do blend/render
DirectX7 can only do the render
The reuse cache for DX10 is @ 2MB. DX7/9 require 5MB cache and more rendering.
DX9 will be 2to3x faster rendering. DX10 will be 10x faster (than current)
DX9 can do 125,000 glyphs/sec. DX10 is 1,000,000 glyphs/sec. Software render on a dual 2.2 Xeon is at 65,000 glyphs/sec
Text should be set to use 6 channels out from the pixel shaders
Note - Current was the day after the X800 release party (with 4 Ruby impersonators at a games place like Dave and Buster's down the street from the Seattle convention ctr.)