If you look up the airport page on youtube there are interviews with management where they say they are still trying to re-start transatlantic. There were even some rumours that EI might be interested but it certainly wouldn't be in 2012 and to be honest I'd be (pleasantly) surprised if it happened at all in the next few years.
Besides, I'm not sure that direct US flights are what IWAK should be looking at as a main priority, the West of Ireland diaspora as well as business links are far more spread around the world these days compared to the traditional US/UK patterns of business and emigration. I'd still maintain that a good hub connection would be a far more sustainable way to get Knock into these markets. But with FR going to Beauvais, flybe to CDG now seems unlikely and KLM pulling out of the likes of Liverpool would not bode well for them considering Knock. Heathrow remains unrealistic due to slot restrictions so there are no obvious avenues open at the moment it would seem.