General comment:
I uninstalled the Wikipedia Android app awhile ago, as I was using it little and didn't find that it added much value to tasks that are useful to me. A few days ago, shortly before this update, I installed the app again and was pleasantly surprised by how much development had taken place in the meantime. The app now seems to be much more media-intensive and colorful than mobile web. I'm not sure how much I'll use the app, but I can tell there's been a lot of work invested in it, and the UX is more strongly differentiated from the mobile web interface.
If I knew less about English vocabulary, I think that one of my favorite features in the Android app would be the ease of obtaining definitions from Wiktionary.
Overall, I'm impressed. Thanks for the good work.