Wow, this is going to make Warlocks very strong. Battle Master Fighters and Monks, too.* Short Rests happen automatically between combat encounters. No word on healing/Hit Dice, but they confirmed that, for example, Warlocks get their spell slots back after every battle (all 2 of them).
Hopefully they expand to 20 in DLC ...*Oh yeah, the game covers levels 1-10.