According to a recent tweet by the main developer of MCPE, Tommaso Checci, we’ll be receiving access to the 0.12.0 beta very soon. In fact, later today!
But of course if you don't care and actually want the MCPE beta, that will be out later today 🙂
— Tommaso Checchi (@_tomcc) July 29, 2015
We’ll be posting all the beta news and changes that come up, so stay tuned for that!