Although not explicitly stated by Capcom, this growth can be attributed to Mega Man 11's continued momentum. The title was recently said to have "performed well" through the end of the First Quarter of the Fiscal Year Ending March 31, 2019 (see page 5 of Capcom's Consolidated Results).
As for Mega Man 11's sales, we unfortunately do not have an updated figure. It does appear, however, that the title did not manage to achieve Platinum status this past quarter after all (i.e sell one million units). Rest assured, though, Mega Man 11 is close. Very close. When we last checked in, Mega Man 11 moved a solid 870,000 units. On the flipside, Mega Man X Legacy Collection was at 920,000 units. Mega Man X Legacy Collection did not reach Platinum status this past quarter, either. Nevertheless it appears both titles, together, sold enough this previous quarter to push the franchise to 35 million units. Not bad at all.
Do you want to know something really great? The Mega Man franchise stagnated at 32 million units in June 2018. In nearly one year's time, it has grown 3 million units. We haven't seen momentum like that in a very long time. Needless to say, you can fully expect more Mega Man games in the future.
Source: Capcom IR