Mega Man ZX3 is the latest cliffhanger game. Whatever happens with that title, I would think that between ZX and Legends, more series could be made, not just one, should Capcom continue creating new series.
Mega Man Legends 3 is something the Mega Man fans have been waiting for in years.
Mega Man X9 would also be nice to see.
Mega Man Powered Up 2 and Mega Man Maverick Hunter X2. I would especially be interested in the remixed music, but also any extra additions they might plan for them. I also wanna know what X2 would say about Dr.Cain's faith in particular.
But personally, I am hoping for a Mega Man X Command Mission 2. I highly enjoyed playing the original one, as I was intrigued by the force metal plot, the immersion, the new villains and new supportive characters. Also, the gameplay was good, and it had some awesome music.
Oh, and Mega Man 10 can wait for now. But it would be magnificent to see that as well, considering Mega Man 9's success.