[Onyxia] What happens in the end?

Hello there,

I read FAQs and the announcement, Either i've missed the information or there was none to begin with, Anyhow, I'm wondering what happens to our chars at the end of contents, Assuming after last phase of WoTLK would end updates and we are not progressing to cata (Wotlk was the last expac to be mentioned), What will happen to Onyxia realm? Would i become a thing of its own? Would characters merge with IceCrown realm? Blackrock realm? Or simply get deleted all together?

Im sorry if the question has been asked and answered before
If so, A link to the post is much appreciated
If Not, I'd appreciate any info regarding the future of realm

Thank you all in advance