Hmmm interesting. Sounds like the 'rumour' hasn't its origins at Zinifex, they are happy to comment. Maybe not from Xtrata... but Oxiana have a no comment.
I reckon it's on!
It's exactly how the BHP-RIO happened...rumours appear and ZFX take off, then it will be confirmed within a day or two and you hope your on the boat, at least before confirmation. It's too big a move to be all rumour I believe.