Well, there's at least a few other options for an intro (assuming they return, which would only make sense...) They could give him one inspired by the Mega Man 2 intro, like in his reveal trailer, with Mega Man initially in the background with his hair blowing in the wind, and then putting on his helmet and warping to the stage. One inspired by the Robot Master intros could also work.
I suppose they were just lacking taunt material? The only thing that really comes instantly to mind for a Mega Man taunt would be
the one featured in MvC 1 and 2, but that doesn't really fit this Mega Man at all. There's not really a ton of flavor animation in the NES Mega Man games to work with.