The switch had the red and blue from launch. In the reveal trailer they only showed the grey, but then in the switch presentation they revealed the red and blue. I don't quite remember, but I think from then on they mainly used that in marketing. It could be the same situation here, but the fact that the joycons already have a hint of blue and red makes me think this will be the only version, as it's sort of a mix between the 2 versions of the original switch.

Personally I like it. I choose the grey version of the switch, and I think making the joycons the exact same colour as the system this time looks way better. Also I like the splash of colour rather than it being entirely grey/black.