My understanding is that Emirates consider OneWorld more accuratly reflects where they wish to position their brand (that is as diplomatic as I can make it!).

There are already existing links between OneWorld and Emirates. BA has an agreement, hatched at the latter end of last year, relating to the London/Manchester Dubai/Abu Dhabi routes as an example.

I suppose Gulf Air is a possibility, but the links between Gulf Air and Emirates are very strong. Emirates are assisting Gulf Air with their "re-launch" activities, but I would doubt OneWorld would entertain a carrier which by it's own admission has "fallen considerably behind Emirates in quality of product".

But we won't know for sure until next weeks meeting of OneWorld CEO's, which has the expansion of OneWorld and admission of new members on the agenda.
MF