Uh. I dunno. Two years, or more, is a long time to be without subwoofer. I don't know what he exactly meant by "revisiting", but maybe that's when they start researching, and not even producing. Who knows.
If you are dead set of JL, and were in fact thinking of the 10", yeah I'd go for the 12" if the size/money is ok with you. The 13" will get you more efficiency, and more power, but the 12" maintains linearity in the higher registers much better than the 13", for better implementation with bookshelves.