There have been some accusations by fans across the internet claiming that Capcom reused assets from Mega Man Legends 3 for this game. Their reasoning is that the engine looks similar and a similarity between a certain character.
Frankly, I could care less if Capcom reused MML3 assets. The game was cancelled and is never going to be released. It makes sense to use finished assets from a dead project.
As for the game itself, I'm excited for it. Looks pretty awesome from what I've seen (hopefully it gets localized).
and if the music in the trailer is from the game, even more awesome.