I work in the off license of one of the Dunnes in Cork. I've been pestering head office for a long long time to stock more craft beers, especially Irish. Leann Follain/Curim/O'Haras IPA are the first. I got a memo back from the assistant buyer a while back which said they had been in contact with some of the breweries. Porterhouse were not interested, Galway Hooker were hoping to be able to supply Dunnes in time for Christmas.
I got no reply about the other companies I asked about such as 8°/Dungarvan/Trouble Brewing/Whitewater etc. There will be new listings but not many Irish beers unfortunately. They might extend the erdinger range and a few others but don't get your hopes up.
Craft beer is a hard sell in Dunnes, wine sales make up the vast majority of the business and thats where all the focus/budget goes.