It is *very* much on the roadmap. (plug) In fact my entire Wikimania talk is around this https://wikimania2013.wikimedia.org/wiki/Submissions/Guided_Mobile_Contribut... :)
I'm on restricted internet for another 4 weeks (grr!) so not sure if development / planning out work will start until my hiatus ends. This *is* high priority for the apps team, and we are planning to have a good part of it (campaigns without the discoverability part) in place before Wikimania, and then work towards adding discoverability before WLM (hopefully). We don't have too many details yet, though.
And the Wikidata part is *awesome*. Will make everything much easier, and Max happy too ;) Yay!
-- Yuvi Panda T http://yuvi.in/blog