Guys,
Just to point out a few things, might already have been covered, apologies if they have :)
TVHGuide is (or wasn't, depends how you look at it) officially affiliated with TVHeadend. However following recent developments it now has much closer ties, the developer John Tornblom is now one of the TVH devs (along with Andreas, Hein and myself). So I'll be getting this much better promotion on the site soon as I can as I myself only stumbled on it by accident some months back.
Transcoding is NOT part of the official TVHeadend release, its John's own feature added to his fork specifically to work in co-operation with TVHGuide. However as he's now a dev and there are several other uses of the transcoding I've been trying to bug him to get it merged into the master, but he's also been working on some other cool features, so he wants to delay a bit. But you can always try his fork at github.com/john-tornblom/tvheadend.
I'm know he'd really appreciate any feedback on use of TVHGuide and the transcoding stuff. Note: transcoding branch may not be completely up to date with tvheadend/master, but it looks fairly close.
As for getting the app in Google Play, its not something I've tried raising with him, but I will.
Adam