Yeah, I noticed on my Android that the wikipedia website didn't have this massive box at the top with text that said "TRY READING THIS ON WIKIPEDIA MOBILE" anymore. There at least one decent wikipedia browsing app for android, but they don't do integration systemwide (I'm not sure if this is a limitation of the android "intent" framework, being able to have an application handle content for an entire website or not) so clicking on a wikipedia link always brought it up in the web browser and not in the wikipedia app.
This is a much needed change, and will only serve to help me waste (?) more time browsing wikipedia finding interesting stuff.