I don't think they would be able to have a Wolf amiibo out at the same time as the DLC.
We don't even have a prototype of Mewtwo's yet.
I'm pretty sure Falco's wave will be with the current crop of DLC characters, not with some Wolf amiibo that somehow managed to get created before characters who would've been out before him for several months.
Right, and I agree. I wasn't intending to imply it was likely either. If Wolf is, in fact, pre-ballot DLC though (possible, but not likely), work would've probably started on him the same time as the others. As you said, Falco is possibly coming with the DLC character amiibo, so they could've created Wolf's alongside those. We don't know what's going on behind the scenes, and I'm sure there are and have been prototypes for the DLC character amiibo for some time that are just getting fine-tuned. They likely started work on the amiibo shortly after the models were completed for the game. They announced the 8-bit Mario amiibos at E3 last month for release in September with Mario Maker. There's more than enough time for a Wolf amiibo to be made before the Holiday 2015 release window.
To be honest, I thought I saw a 2016 release date for Roy and Ryu's amiibos, but I couldn't find it. I watched the New Content Approaching video again and it simply states that the release timing hasn't been decided yet. I was thinking if that was true, then Falco's amiibo might just be a store exclusive released by itself, similar to Palutena and Dark Pit being exclusives and their own separate "wave".