Not sure what the go is with the torana, i think its future is looking a little uncertain with talks of the camaro / holden VE coupe coming to town late in 09.
If the torana is released i highly doubt there will be perfomance versions such as the SLR, as holden already has that covered (or will do at the time)
They were saying however, that the torana is destined to be a 4 cylinder slug too take on the likes of Toyota etc..
I wouldnt hold your breath for a performance version though.
Dave