Yeah it's about having more videocard power for new games. Has anyone seen the videos of the new Crysis game? FUCKING AMAZING, it will be the best game of the next year or two. Hands down. If you want to play any of these games with nice details you're going to need a DX10 card. If you're just interested in Half Life 2 and Counter-Strike or World of WarCrack then a 7900GS will be fine. I have a highly overclocked 7900GS in my laptop right now and play HL2 in 1900x1200 just fine.
The nuke at the end of the video blew my mind, no other game has come close to details like this.
http://www.youtube.com/watch?v=IGQ8OobkWio