I want multicore support to actually work on my computer. That way fps might get above 20 on occasions. Or I might even be able to take some settings off low.
Even though I don't play soldier nearly as much as pyro, engy, spy, or medic, I thought it should have been first. Though I can't think of any good ideas to diversify the play style of the soldier, hence why I don't work for valve. Well... that and lack of knowledge in programming.
The pyro flamethrower should stop showing flames when not firing. Or, the glitch can stay and they can make it deal damage without using ammo for a week. You know, to drive spies crazy.
I wouldn't mind seeing an eGO hat or such if they are going to have hats that look cool but don't do anything gameplay-wise.
I guess more than anything else, I want some good new maps. Maybe a king of the hill play style, or some maps that are nice and balanced so that every class can play well on it (like badlands). And I'd like to see some PL maps that aren't super skewed in the defending team's favor.