I don't think there is a new beta version for 4.2+ yet. Actually I've found the beta versions have often solved many people's problems. Sure there can be unknowns in betas. And before trying out each of the LW betas from 4.1.4 onwards, I was very wary of betas of other programs. But as I said to you earlier, these ones have/had been very good. Probably best to stick to the official releases unless you start having problems or there's great improvements as there had been with the last series of betas.