Perhaps they will add these routes shortly particularly as they're unlikely to begin before June. Otherwise the airport press release is based on wishful thinking. It's very hard to quantify the numbers travelling for the so called Gathering.
There's a tendancy to hype these things up in the media and I'm not at all sure if Cork will have the direct access and capacity needed to benefit from it even if it does lead to an influx of exiles.
Services from the likes of Lanzarote, Faro and Malaga and other bucket and spade routes will be useless when it comes to catering for these people.