Don't know if this has been posted before but here it goes anyway.
Halo: Reach is being propagated as the next game to use technology that packs a wallop and this is what is being discussed as being put into the new engine that is being developed for the game. These features were spoken extensively at this years GDC conference with reference to DX11 technology:
-Tessellators with close to 30K characters to achieve cinematic quality features.
-The Hull Shader to patch control points in order to modify the behavioral pattern of the tessellator.
-Domain Shader to optimize performance of the output of the GPU in order to mitigate bandwidth use.
These features allow real-time display of real-time images which are otherwise not achieved making creation of objects in the world easier for programmers whilst saving up on a limited memory module. Silhouette elaboration and terrain rendering whose objects offer a healthy degree of curvature.
All this allows for a visually heavy game in the Halo series. More as time elapses.
http://www.gameguru.in/first-person-shooters/2009/11/the-technology-powering-halo-reach/
hmmmmm, July 11th, i was completely unaware of the existence of this article.
30k seems like a high number, it's a believable number for some games but considering of how many soldiers are usually on screen in many halo games, i think the performance would drop quite a bit.
it does however mention the use of tessellation. (a feature that i think would give it the necessary boost in performance with using such high polys.)
Tessellation was used before in Halo wars, though it was entirely for terrain purposes, and i think that's where my money would be on for Halo reach.
though considering that Reach does run on a completely separate engine than all the other halo games, it's possible to say that feature could quite as well be used on other things too.
with little evidence to support 30k models being used, I did examined the model of lone wolf that bungie posted on their home page a while back, my guesstimate does lead me to believe the level of geometry may be greater than gears of war 2.
same pic but with brightness up 60 percent.
http://i45.tinypic.com/2py9axh.jpg
comparing some of halo reach's captures to gears2's.
original Lone wolf shot from Bungie.net
http://www.bungie.net/images/Games/Reach/vga/Bungie_REACH_1280x720.jpg
Gears of war2
http://screenshots.teamxbox.com/screen-hires/81474/Gears-of-War-2/
Halo reach
http://i101.photobucket.com/albums/m49/aerofx/Untitled-5.jpg
marcus fenix in both gears 2 and 1.
http://screenshots.teamxbox.com/screen-hires/81383/Gears-of-War-2/
http://screenshots.teamxbox.com/screen-hires/54420/Gears-of-War/
it does seem to show a bit of a gap.
edit, sorry about that; it's been reedited now.