It seems that Yuji Naka, creator of Sonic and more recently responsible for Balan Wonderworld, no longer belongs to Square Enix. This has been revealed on his official Facebook page.
There is no longer any mention of Square Enix, unlike weeks ago where we could see this company as the place where he worked. Now it seems that this is no longer the case.
There have been no official statements on the matter, but all indications are that, after the failure and controversial release of Balan Wonderworld, Square Enix may have dispensed with Naka’s services for the future. We will stay tuned for more details.