Right on cue!
Sweet!
Okay, where to start...for one, that silver car is the Toyota Alessandro Volta. Go to Toyota.com and you will plainly see that it is NOT a Supra, and the only thing the two have in common is that they were meant to be flagship sports cars. The Volta is powered by the 3MZ, 3.3 V6 from ES330s, Camrys, and all those other POS' and is a MR setup, not an inline 6 with FR.
Secondly, that masked car is the Lexus LF-A, again NOT the Supra. Cant remember if its been confirmed MR or FR (since the radiator(s) are in the back, I'd assume the engine is as well), but it IS powered by a 500PS (so like 495 HP) V10 F1 inspired engine.
http://lexus.com/about/concept/lf-a_...or_photos.html for, yet again, official straight-from-the-source information and pictures about it.
http://lexus.jp/models/concept_car/ for the Japanese site.
3.5 V6, RWD, with 300 HP? No way! Thats so like...I dunno...
the IS350 that has already come out!. Even IF the Supra is rereleased (which it wont be!!!) it would be probably 3.5 V6 powered, then a 4.5-4.8L V8 for the higher end "Supra GT" with closer to 400HP.
As far as that last article...I think its older than me. That shit has been around since the 90s, I guarentee you...