You and gravel rolled both qualifications into 1 person on your guesses, and Koju was clarifying that there will be a shapeshifting character AND a telepathic character coming out soon. Not to say either of your guesses would be wrong, since they can technically qualify for both.
Telepaths - Professor X has to be a 4 star if Nick Fury is, and they don't need any more of those any time soon. Jean Grey as a 2*, and Phoenix as a 3* would be plausible (or 3*, 4* alternatively), but that makes too much sense, so that won't happen. With those 2 out of the way, my next thought was Emma Frost.
Shapeshifter - My first thought was Reed Richards, to add to the F4 family, since his hyper-elasticity is "technically" shapeshifting.