Luffy grabbing the ground and stretching it looks like what you'd expect of a DF Awakening for a rubber fruit, but the translation I read also said something about Nika's powers being based on his imagination. It'd be wild if we got some kind of toon force reality warping power in OP.
And I wonder if this means Joy Boy also had the Nika fruit? Or were Nika and Joy Boy the same person? That has yet to be established.
I also wonder if Nika himself even existed, I assume he did, because all Devil Fruits have been based on something else, but mythical zoans in general throw that notion into question.
Also hilarious that Oda was serious in the SBS when he said Gear 5 was coming soon.