1TB drives in that format came out not terribly long ago was it not? Manufacturers (the few of them that remain) won't launch anything any sooner than a year later at least, so summer/autumn-ish we may start hearing something.
Typically products in the storage industry are announced by their makers a very long time before sales actually start happening (very likely due to the rigorous quality testing/verfication neccessary), and since there haven't even been any announcements yet there's no reason to believe there is anything imminent on the horizon.
I suggest purchasing an external, bus-powered drive to tide you over in the meanwhile.