Just noticed a couple of things about the teleporters:
The exit now looks like this when it's at level 3. Afaik, I'm sure it didn't look like this prior to the update.
Also, if you build your entrance and get it up to level 3 and then build the exit, it automatically starts at level 3, which is good. But if you build your exit first, get it up to level 3 and then build the entrance, it only starts at level 1.
I've just played in a game that consisted of 32 players made up mainly of spies and engies, with only a couple of people picking other classes
it was such a laugh, everybody experimenting, sappers everywhere. Needless to say I don't think anyone was overly concerned with completing objectives