First, there was an announcement of a BMW-Toyota joint venture. Said venture would, among other things, "Set up a feasibility study to define a joint platform concept for a mid-size sports vehicle."
Upping chances even further, a new Automotive News report claims that incoming Toyota chairman Takeshi Uchiyamada wants a vehicle "comparable" to the Supra. Clearly there are a lot of parties that want a new Supra to happen – to say nothing of enthusiasts – but Uchiyamada might be just the guy to get it done. None of this is proof positive of an impending Supra, to be sure, but winds do seem favorable.