Minecraft PE 0.12.0 release date?

There's no discernible correlation between the PC update and the PE. But I myself was thinking it has been sometime since the last PE update. We won't know until it happens.

The Release Date will be sometime in August 2015

Like mentioned above, Minecraft PE has nothing to do with any other versions of the game. So just because the PC version got an update or in this case the Windows 10 edition came out, doesn't mean they will update the game on other platforms at the same time.

Minecraft PE has not been released on any android tablet or at least for me. But I hope it includes horses