I think we'll want to let the changes simmer for another week or two and then dig into a few specific things:
1) Do the pageview stats hold? e.g., are we still getting relatively few opt-outs?
2) How has this change impacted new mobile user numbers (registrations, 1st time editors, active editors, etc.)? Early results[1] show a healthy spike in new signups coming from mobile in the past few days, and we need to keep track of these users to make sure they're going through the new and active editor funnels at a reasonable rate.
3) How does the heatmap of taps look? e.g., how often are people accessing hamburger menu items, language selection, history, etc.
Based on the data from the above, we could do some UX optimization – the designers are very keen to refine the UI for page actions (instead of dumping features like language selection and page history at the top/bottom of the page kind of at random). If the new and active editor conversion rates are low, we'll need to prioritize work on new contribution funnels, but realistically that's probably not something we'll be able to tackle until Q2 of next fiscal.