For real though, it has been discussed several times on the forum.
If you want my guess, it will use a new 3JZ-GTS inline 6 codeveloped with BMW running on unicorn farts. It will also have a hybrid system plus ATTESA-ETS (yes, Nissan's joining in on this one too).
I'm just making stupid shit up at this point, but it's still more believable than moroning.com.au.
Anyway, back to popcorn.