This is the first anthology of African Science Fiction, according to its own site, and they've already signed up:
Established African writers like Nnedi Okorafor (2011 World Fantasy Award winner), and Lauren Beukes (2011 Arthur C. Clarke Award winner) [...] for the anthology.
Sounds like a great opportunity, if you meet the entry criteria. The anthology accepts SF short stories only, between 1500 - 8000 words, but most importantly:
Only African writers are eligible (writers born in Africa, or having domiciled in for over 10 years, and/or holding citizenship in an African country)
Submission guidelines here: http://afrosf.submishmash.com/submit