I will help share the stories about programs in Africa as much as I can, during the event.
I wanted to add a thought about the scholarship process. There is no need to speculate how it's decided (e.g. the "visa problems" theory, which is certainly incorrect). The scholarships process is documented on the Wikimania site[1] and there's an FAQ document too[2] the *criteria* by which the volunteer committee[3] -- which only has one member from Mexico -- makes a decision are spelled out there[4].
The Wikimania scholarships are a competition between many deserving people for very few spots (91 scholarships from WMF, another 15 from WMDE, and a few from other sources). The *criteria* are what the committee uses to pick the people it would be *most* useful to send to Wikimania this year. What the committee does *not* do is make representational calculations like "not enough people from Africa" or "not enough women".
It is of course frustrating to not get this great opportunity. But there's always next year, and paying close attention to the criteria[4] (which I dare guess not all of you who applied did) and building your application to demonstrate how you meet them (if you do) would greatly increase your chances next time.