Interesting, there is so much speculation around at the moment, I wouldn't be surprised either way about him returning or not returning.
What I was told was the big issue was mentioned here earlier by DJRMAD, the fact it took FPR to supply the setup for him to get any pace at Adelaide and he can't "gel" with the current engineers.
Another issue is that he has spent almost his entire time back in Australia at DJR, even Dick picked him up from the airport and drove him straight to the workshop. It doesn't help trying to settle the family back in Australia when you got so many commitments.
With all his millions he is reported to have now, would any of you be putting in 100% at your job? Me, I'd be retired to some nice quiet water front location.