Hmm, seeing as there are decent looking Goomba, Toad, Shy Guy, Koopa and Spike models in the crowd, I reckon we'll be getting the latter three as characters also. (Yawn tbh.)
The precedent was set with this launch title really as to what that logo appearing on the cover can mean:
Here is a more recent example but this game actually has online multiplayer
Of course all amiibo compatible games omit the Nintendo Network logo on the front for noise reasons I guess. The back still details what amiibo and Nintendo Network functions there are.