Kevin VanOrd (Gamespot) asked XCOM 2 lead producer Garth DeAngelis some questions about the Chryssalid:
More information.It came from outer space.
If you’ve played an XCOM game in the past, then you know the Chryssalid, the most frightening-looking alien the games depict. In XCOM 2's multiplayer, you will get the chance to command one of these extraterrestrial meanies for yourself, but most of the time, you will face a chryssalid as an opponent. Developer Firaxis hopes to make this gruesome unit an even more intimidating force in the upcoming strategy sequel, and lead producer Garth DeAngelis recently divulged how the team is doing just that.
GAMESPOT: So the chryssalid returns, but outside of multiplayer, there's no chance of somehow recruiting one to join the XCOM forces, I presume?
DEANGELIS: The chryssalid is very much still one of the alien occupiers of Earth. They are against XCOM. They will never become a part of your army.
We had to have them come back. They've been a staple of XCOM, harkening back to the original UFO defense. A couple of decades have taken place since you lost in Enemy Unknown. A lot of the enemies have evolved. Now, the chryssalid, they're a little bit too crazy of a species to integrate human DNA into them, but they have evolved. They've received some upgrades. What they did in Enemy Unknown, is they implanted XCOM with something that would then breed another chryssalid out of them, if you remember. It was a pretty terrifying sequence. Design said, "How can we make this crazier?" [...]