Late last week French and Mauritanian media that the new G5 Sahel Joint Force commander will be Mauritanian General Hanena Ould Sidi. He replaces Malian General Didier Dacko, whose removal was one outcome of the 2 July meeting of Sahelian and French heads of state in Nouakchott, Mauritania.
Ould Sidi is Mauritania’s Vice Chief of Army Staff. He is mentioned in a few brief news items at the Mauritanian Army’s website (example), but other than that I can’t find much information about him, either in French or in Arabic (here is the Arabic spelling of his name, for those curious).
La Tribune reports that at the G5 Sahel Joint Force, Ould Sidi’s deputy will be Chadian General Oumar Bikimo Jean, whose French-language Wikipedia page (which is pretty well sourced) is here.
Sahel Blog 
Dear Thurston, thanks for this update. Do you (or other readers) know what this means in terms of operationalising the two phases/deployment across of the FC-G5S in the other sectors. I believe Mauritania felt that the onus was too much on the Gourma-Liptako region and central sector? Best, Sophie
Really good question. I haven’t seen anything about how the change of command affects those phases, unfortunately.