Here is ATI's "confidential" HD58xx viewgraph set. Over 20 viewgraphs.
It lists "all" the HD5870 features. For those interested in what ATI thinks of HD5870 versus Nvidia's Fermi (300 series) -- that's in there too.
Needless to say, the viewgraphs make ATI look good because they are ATI's viewgraphs -- just like Nvidia's viewgraphs make Nvidia look good.
One viewgraph lists the first crop of DX11 games and when they will arrive.
For what its worth to those of you with HD58xx on your mind:
HD5870: ATI Viewgraphs
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ATI Crossfire Sapphire 2x HD5870 - Eyefinity 5760x1200 24", 1xDell-U2410 H-IPS + 2xHP-ZR24w S-IPS, Phenom II X6 1100T@4.0GHz w/Swiftech Water Cooling, 16GB GSKILL PC3 1866@1333, ASUS Sabertooth 990FX, WDigital + 3x Seagate + Hitachi + 2x WD Ext = 10.0TB, Sony DVD, OCZ ZX 850W PSU, CoolerMaster HAF922, TM Warthog HOTAS, TM T-Flight Stick X, TM Cougar+FSSB & CH Pedals, Saitek X52 Pro & Pro Combat Pedals, TrackIR5 w/TC Pro, Windows 7 HP 64b