I was planning on checking my missions to see if they all worked, and also to try to implement some things based on the new changes (higher detail limit!), but the Foundry is down, so I guess I'll have to spend my time doing something else.
Yeah, I monkeyed with Foundry on tribble enough to know that we will need to verify that all of our misisons work as intended. One of the older missions I played had a map where it now caused you to spawn UNDER the floor. This mission may have predated season 4 though, I'm not really sure. (I think it was last publish Nov 2011)
However, another of the old missions I played worked just fine. So it's a bit of a crapshoot.