What manga is Ken Akamatsu currently working on? Is Ken Akamatsu currently working starting a new series or planning to release a new one this year? 

I understand that Negima ended some time ago. A mangaka's gotta eat, after all.
He is working on a new manga series (name unknown) which is apparently scheduled to begin some time this summer. It was originally set to be released in spring. As noted in the article linked below, he has stated that this will be his last series; he plans to retire after it.

Source: Nikkei
Translation: OK