We don't know if the TBD is for Michelle. I also don't think it is fair to accuse Michelle of using delaying tactics and how it has affected other skaters assignments. It is all speculation and supposition at this point.
I expect Michelle will enter Grad School in Sept. If she does not then I will
consider that she might attempt a comeback. As far as Michelle joining SOI to tour don't hold your breath, she has gone that route for years with COI. We know that Michelle is training but we don't know what for. She just might want to see what her body can do and has no plans to compete at all.
Of course if she comes back I will be cheering very loudly for her, Sasha, S/Z and Plushenko.