I hope it's so close to v1 that maps/scenarios are compatible. If I can't play "Sunken Defence 12way" or "Hunters 1N5@n3 $$$MONEY$$$ D00Dz!!1!" I'm going to pout :-P
Hope they've added better scripting tools too.
As popular as v1 still is, I'm surprised they didn't release a few more expansions.