Also heard credible rumours about the 767 on the horizon however, it has been said before! (...so I'll believe it when it comes over the threshold!)
As to which type: it depends what / where they want to go as to which type they aquire. The -300 offers more seats so more potential return but the -200 would give better performance out of LBA (if that was the proposed point of departure.)
On another topic the extra 733 rumour must be true: GCGET appeared over the threshold at LBIA this afternoon! It was promptly tucked up in the hangar - no doubt to receive Jet 2 decals over the weekend.