Gears of War had a trailer at E3 2005. I would say the graphical leap was VERY obvious in that game, as well as Kameo, which is a launch title.
In the end I imagine this is going to come down to console preference and what your idea of a generational "leap" is. I haven't seen anything on the level of Kameo or Gears of War yet. Maybe we will at E3.
I think, if anything, this is just a testament to how good the graphics are NOW.







