Just got to try this out at the Nintendo booth. I was pleasantly surprised! There's an obvious downgrade in graphics and resolution, you shoule not expect to see a game that looks as good as the ps4/x1 versions. But, with that said, it is definitely one of the best looking handheld games on the Switch. The action was buttery smooth! I can't tell if it's a locked 60 fps but I did not notice any drops. Felt very natural to play with the joycons and the split dpad even. Overall I am extremely happy with the Switch port. Plus, it being an older build can only mean the final release will be better. I might double dip with Ps4 just so I can have one version on the go. I couldn't see it in docked mode, although I probably would never play it docked anyway.
There was one instance where the game froze on me after stage selection, but that's most likely a demo bug.
Thank you! Thar sounds like I will keep my preorder then!