That sounds exciting, and I feel inclined to believe that. I hope they don't go overboard, though. Battle for Eire's theme is Ireland's "otherworld", whereas Grogan's Pub represents BGW's "real Ireland". If there is any crossover, it should be very subtle, in my opinion.
That said, Killarney takes a more unconventional and fanciful approach to what is real than most of the parks' villages. That fact has long been the topic of heated debate, as to whether or not they should use such storytelling in their countries represented. In Killarney, "magic" and "the luck of the Irish" can be found almost anywhere in the village. The more obvious examples are things like the enchanted tree and the pot of gold hidden in the fountain.
There were more subtle references at one time, like town notices from fictitious characters that existed in various shows and attractions throughout the village. One was written by Seamus; the villain of Secrets of Castle O'Sullivan, pertaining to something stolen by a mischevious leprechaun named Clancey.
One of these days, I want to create a thread about BGW lore, and how it's all connected. Ireland might be a great start for that, although my focus is mainly on Germany now. I just hope they don't ruin a good thing with Battle for Eire.