Act 1 Revamp
Me and my boys started some new accounts the other day and I'd just like to say that Act 1 has improved immensely with the champs you fight and is really fun. Being able to get the gold you need to level and the units you need to unlock the key masteries means you don't feel like you're grinding just to make little progress.
Only downside is Act 2 now seems twice as bad in comparison.