I hope for many on-foot only maps and modes, i want small/medium maps with crazy jumps, complex structure etc to allow crazy fast gameplay, i have never liked vehicles and their changes to gameplay and maps, UT99 should be the primary model for this game imo.
I liked them in Assault, because they made sense (at least in UT2004), but in any other mode, let them be environmental set pieces (ie burnt out wrecks/in the background), but not actually usable.