This week, the Korean Game Rating Board has reportedly rated a game called "Mega Man Legacy Collection 2" for PlayStation 4, Xbox One, and PC.
The game's description lists Mega Man 7, Mega Man 8, Mega Man 9 and Mega Man 10 as included titles. The first Mega Man Legacy Collection included Mega Man 1-6. It was also released on PlayStation 4, Xbox One and PC in 2015, with a port to 3DS in 2016.
"Mega Man Legacy Collection 2" hasn't officially been announced by Capcom yet, but this is pretty solid evidence of its development.