Back in last gen, games that had sequels usually had a pretty nice step forward in the grpahics deptartment. (Such as Halo and the Splinter Cell series).

Now with the next generation games and all that photo-realism graphics, is there really much to upgrade in terms of graphics aside from a newer art style? Is there really room to upgrade the graphics when Gears of War 2 comes along? (as an exmple) Although, somehow the Splinter Cell series always seems able to upgrade its graphics looks every year...but that was last gen...what about now?