It is reported that in the future (Patch time) that they will no longer be able to Teleport. Thus rendering them truly immobile.

If/when they do this, I would hope they would allow static pretenders more of a "At home bonus".

I'm trying to think of how good a Sphinx would be if he is unable to move. And if he has to sit at home. I can't think of alot; since it is common practice to preach a pretender out you can't touch, or with a strong army.