I'm rather curious how development progression is going. Are they simultaneously working on the other acts and regions? Are they building ground up?

They should be releasing content as they go or at least any act 1 progress, items or game mechanics. If it's unbalanced or buggy, then all the more reason since it's the reason many people bought the EA.

I haven't touched this game in months because there's no new content and no reason to keep playing. What's there to test has been tested, what feedback to give has been given. It's time to add all the new progress they've made to be broken and new feedback given.

My biggest concern is this: They do the EA for Act 1, but their release history says they should be doing so for the entire game. Once the final product is shipped they end up making an updated release shortly after with feedback. It's like they're charging for EA twice and double dipping.