We can only guess from the shaded imagery about the membership -- and possibly its mission. Marvel Comics plans to unveil a new members of the team each day this week at noon.
I have some thoughts...
Here are my initial thoughts about the members: Havok! Psylocke! Feral! Nanny! Orphan-Maker! Vulcan! And two others who don't make any sense visually to me!
Starting tomorrow, this mystery will start to make some sense!
I will post more as I learn more!