It has been confirmed on Flyertalk by several members that the Thank You Point fixed flight option will terminate as of March 1, 2009.
I have no more information.
If you are collecting Thank You Points I suggest you call to confirm and get to 90K ASAP.
Buy them if you have to.
I can now confirm this info and confirm that after is available you got it. That means that a 5 point bonus card will be giving you a 5% return.
I just booked 90K from my account and 90K from Katy’s account.