Got a link?
The whole BMW/Toyota joint venture is old news, and there was always speculation and rumours that the car that was produced would be named as a Supra, but that (afaik) has not been confirmed by either manufacturer.
The most likely course would be if the new Z4 was part of the joint venture, then Toyotas would more than likely be a resurection of the MR2, using the same platform, as both will be two seater sports cars, looking to compete with the likes of the S2000 and MX5.
Much like the Toyota/Subaru collaboration for the GT86.
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Oh, and done btw