it wont be locked however i know im in minority with this but, i believe ALL acts should be locked until you have 100% explored all the ones that came before it. Way too many people complain about no content etc when they just run through everything for completion, how many people have did their first run of Act 6 without having explored none of the other acts Are you insane? Requiring Act 2 Expo for Act 3? Act 4 for Act 5? Act 5 for Act 6? What? That is a horrific idea.
it wont be locked however i know im in minority with this but, i believe ALL acts should be locked until you have 100% explored all the ones that came before it. Way too many people complain about no content etc when they just run through everything for completion, how many people have did their first run of Act 6 without having explored none of the other acts