Could be Jet2? Where has this rumour appeared from?
It could be SkyEurope, but as they are dropping Krakow from the winter season (this is correct, right?), they would either have to open a base at Gdansk, or W it from Bratislava.....
Which airlines, exactly, are left at MAN now?! They havn't done a very good job of retaining services recently. Some good news to come, maybe....