I don't think so. He replied that he thought that lil akamaru would have filled it perfectly as mascot but he noticed that he isn't lile anymore but just a big dog xD. Then he said that Gamakichi would be also a mascot but he made growing too LOL
I must to say... What kinda useless questions they made at JF? Who on the earth cares about Naruto's mascot. For god's sake, you have Kishimoto in front of you and you just ask him about naruto's mascot? What a waste of time.
This reminds me of that Family guy episode were they went to a Star trek convention and none of the fans ask the STNG cast a single star Trek question