UT2, from what I have gathered, will not become another Tribes, though the game does incorporate some of Dynamix's features...
The maps will not be nearly the size of those found in Tribes 2...there's no need to. The map size in Tribes 2 was tied in with the idea of conflicting tribes warring over vast amounts of territory.
And as far as shields, vehicles, etc., I think it adds another level to theg ame. But I'd trade it all in a heart-beat for a jetpack.
I say, "Good job, Infogrames!" I can't wait! >:D
"As you do not know what is the way of the wind, or how the bones grow in the womb of her who is with child, so you do not know the works of God who makes all things."
-- Ecclesiastes 11:5