They have only said it vocally, that they will only work with Nintendo, so in a sense, legally, they are not second party, they are third party.
We still do not know how those two games will turn out to be, so at the moment they are just to new IPs that may become a success. Sony doubtfully putted a effort on this, and even if they did, it still is from SE, not a Sony blockbuster.
Ask that Nintendo of Canada guy, I'm just quoting what he said :v
@Alternine: Atleast I'm talking new as in new game announcement, not new IP or anything like that.
@Arlo: Those indeed have a good reason to be angry, though I don't see why they would had gotten a Wii U on the first place, if they still were not sure about it and its future.
Next Level made an announcement, so I would assume they made a deal thus legally making them 2nd party.
Ok fine, let us assume those new IP (which seem to have a vast amount of potential) are not good, Sony still made a huge effort for street fighter V exclusivity and Microsoft made a huge effort for Tomb raider exclusivity. That potential was there for Nintendo, but because they did nothing of that sort, we see just how much "effort" nintendo put to building their library.
At least both others showed progress in uncharted 4 or halo 5, both of which are individually more impressive than any upcoming wii u game.
Until I see more third party support, I won't act as if they have that support now, because for all we know, that support could go the way of project cars. Also it would make sense for that Nintendo rep to put the wii u in the best light possible, even if it meant stretching the truth.