Hello Odd! I am going to say yes for the MA, with more variety added with Vehicle and Flak bases.
Events' arenas, I am guessing, could change things up and could mix in the old with the new or do custom fields (at the cost of the upload size).
Correct me if am wrong, but it seems that the terrain itself may vary. What I mean, is it seems that hills and elevations are more tolerable with the new version. So, I am guessing that the same field layout may look quite a bit different from the aspect of ground level. Then again, I have very little with the Terrain Editor and I might just be injecting pure speculation.