Yes there have been some talks about an expansion, we are currently on the 2.x's because in fact A realm reborn is an expansion to 14.
We don't know much about when its coming and it won't be some time yet since the story will apparently need to lead up to an event much akin to the end of the 1.x's though people like to hedge there bets on some time mid 2015, I've also heard in some places the content which we will be getting will possibly rival the amount of new stuff from 2.0 (which was a complete redesign so I'm not sure on that one.)
It will also include flying (On Free Company Airships if I'm not mistaken) which is what I am looking forward to.

So yes there has been talks, I hope you look forward to it