I'm not sure it is a St. Pats seasonal, as when we toured the St. James Gate facility back in October on our trip to Dublin, all of those beers were for sale there, albeit in bottles. I didn't drink any at the time, for why would you drink bottled beer at the Guinness brewery?
I think these beers represent another tempered step by Guinness to compete in the craft beer market. These beers are certainly much better than their Nitro IPA and Black Lager, which are wretched (IMHO).