So, apart from gameplay changes, I am pleased to say that there was some netcode improvement they snuck in under the radar.
Re-syncs! The game now re-syncs at the start of every round, same as SCV. You should get the same familiar burst of speed you're used to. I don't know if it re-syncs mid-round or not as most of my matches actually played pretty well tonight, but there is definite re-syncing at the start of every round.
Yay for small victories!