Hi Thomas,
Disclaimer: I'm not in
Wikimania, so it's hard for me to know how much more you've discussed this with others in the team. I know you've had some discussions with Oliver, too.
For the record, in the Metrics Meeting on July 31, the Analytics team presented an overview of Mobile.[1] For that presentation, we produced world maps (per country) of edit counts and readership, for each of the (device, site) pairs.[2] I'm in the process of writing up the results in a meta page. If you're interested in per country contributions from April 20 to July 17, 2014 (removing countries with very few contributions), that data is available. This means that for this period, you can get country code and count of edits.
If you absolutely need IP addresses, I'll let Aaron/Dario elaborate on this.
Best,
Leila
[2] Device is one of the desktop, phone, tablet, and Site is one of the desktop site, mobile site, or app.