I’m guessing LR may go the way of Photoshop Elements which has always been a perpetual licence, but Adobe is paving the way for Photoshop Elements Everywhere. So a choice is given where subscribers get regular updates and outright buyers have to wait for a major dot release.
I think Adobe will wish to evaluate the success of the Photography Program (LR5+Photoshop CC) and the number of subscribers that renew. That will depend on the previous price promise.
But like all the others here; I don't know.