No new maps but some very, very necessary exploit fixes and balances.
No more infinite hunter spawns. No more tank stalling on Blood Harvest last stand. No more witch dragging. No more map skipping. No more minigun hopping. No more kill command.
Smoker has been made better. Hunter has been rebalanced (melee was too good and pouncing too worthless). Tanks and witches now spawn at the same % completion of a map and spawn separately for certain for both teams. This increases first infected advantage but removes randomly unfair situations.
Fast melee has remained untouched. I'm not certain why. I don't consider it a huge issue, but it seems that if they wanted to leave it in it wold be made more intentional and more accessible, and that if they wanted to take it out it would be simple to do.