From memory this bypasses the Gatecrasher mission (and the tutorial), dumping you into the Avenger with all four rookies from that mission ready for promotions. I think. But some words would be nice.
Of course there's rumours. General consensus is that there will be a larger expansion, along the lines of Enemy Within, sometime next year. No confirm or deny from Firaxis though.
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Is there any rumors about new DLC for Xcom 2?
Interesting Reddit thread: New Environment Types Referenced in SDK! (big spoilers for DLC locations, view at your own risk). Assets have since been removed.