They actually just changed the map rotations on the PTR. Only ranked will have the new rotation, whereas UD/QM/AI will have all of the maps available.
http://us.battle.net/heroes/en/blog/...-2017-6-5-2017
The experience you gain post-game is based on the experience your team earns in-game. Then any bonuses and multipliers are added on after (like stimpack, party bonus, first win of the day, win bonus, ranked bonus, etc). It's for this reason that you gain a lot less exp in losing games. It's not just that you miss out on the 50k for winning, but also the losing team tends to be down in levels, sometimes with a 3-4 level deficit.