I hadn't heard anything about this until just now:
http://www.battlefleetgothic-leviathan.com/
Basically, it's a full rules implementation of Battlefleet Gothic for iOS and Android.
It's really good. It's a solid implementation of the ruleset and so far, the campaign is fun too. Only Imperials, Space Marines, and Nids so far, but they say that more fleets are coming.