Maybe, maybe not. Last time they updated the test there was a transitional period of a few months so it is possible that they'll drop the new version with relatively short notice. The main thing the UKBA will be concerned about is giving retailers enough time to order stock.
That way the UKBA will be ready, applicants will have access to study materials for both versions and independent operators will just have to catch up. I may be being cynical with that, of course - only time will tell.