The Awakening starts by expanding the title’s fourth act, going on to add a new socketable layer to the passive skill tree, new maps, more skills, legendary bosses, tons of new items, and plenty of quality-of-life tweaks. It’s such a major update, in fact, that Grinding Gear is informally calling it “Path of Exile 2.0.”
You can read up on the patch notes in preparation, and when you’re done with that, you can watch the official trailer below!
Source: Patch notes