After laying dormant for several years, Capcom slowly started breathing new life into Mega Man with the launch of Mega Man Collection and Mega Man Collection 2 in 2015 and 2017, respectively. But, it wasn't until Capcom released Mega Man 11 in 2018 that fans started to believe that the company has bigger plans for the franchise.
Although the two-part Mega Man Battle Network Legacy Collection is still set to come out next year, the latest word on the grapevine is that Capcom is working on Mega Man 12 with plans for up to Mega Man 15.
Rumors about a new Mega Man game started when Capcom registered the domains for Mega Man 12 up to Mega Man 15 in 2018. The registrant, the GMO Internet Group, is the one responsible for registering website domains for Capcom. It's not unusual for publishers to lay claim to domains of their biggest games even though they have no plans for them at the time. It's a lot cheaper to maintain ownership over a domain than to pay someone who claimed it first, or fight them for it.
What's interesting here is Capcom actually bothered to update the registrations of the said domains earlier this year, as noted by Rockman Corner.