if you read the article, since the project is complete, both manufactures can do as they please with the BRZ.

Quote:
The BRZ -- really, could Subaru have come up with a less evocative name for a sport coupe? -- is on some levels the most conventional car Japan's quirkiest automaker has ever built. But it opens up some intriguing possibilities for the company, especially as Subaru and Toyota are free to develop the BRZ hardware any way they like from here on in. Subaru engineers quietly concede there's more power to come from the boxer four, though they won't confirm whether a turbo is in the works.


i think its only a matter of time.