I work at HAJ and have not heard any rumours about Ryanair operating out of HAJ.(mind you I'm always the last to hear about These things in the first place!)
I was told that (rumour), that Ryanair wanted to fly out of HAJ in the past but the powers that be did not want them as they did not want the "low cost Airport" tag attached to HAJ. Plus they got pressure from Hapag (Tuifly), which has their base in HAJ and from Air Berlin saying they'd pull out if Ryanair came in!
Don't know how much of it is actually true though.
If Ryanair were to come i wish they'd Flybe competition to Manchester as Flybe are quite expensive.