XCOM 2: War of the Chosen is the game of August, for me. I am greatly anticipating it.
WotC is adding a couple big new features, like the titular Chosen, new enemy units, and new classes, plus a ton of new mechanics, but is also bringing a bevy of smaller changes. It rebalances the game a bit and makes the base game longer. The expansion, with a few of the comissioned Pavonis mods, will turn XCOM 2 into a legit Long War 0.5, which is exactly what I've wanted from it.
This video featuring lead designer Jake Solomon (80 minutes long!) gives a new introduction to all the new stuff. It all sounds so good, like a dream come true..