I'm watching cyrious' stream and it sees that the bases havent changed and you still have 2 wapgate bases and one middle base for each side (9 Bases in total).
I can really say mutch about the terrain, because as infantry i havent seen mutch of it, but it looks like they change it a bit (but it's still pretty mutch like the first map)
I think the only think that really changes is the way the outfit war is executet (playoffs, semi finals, finals and so on)