Yes, while we heard May for definite a few weeks back it has now been officially confirmed that Korra Book 1 will premiere in the UK and Ireland on Sunday July 7th 2013 at 9.00am. New episodes will air every Sunday at the same time. It will be repeated 1 hour later on Nick+1. Along with that it is confirmed that Nick.co.uk will be updating their site to include a Korra page, which I assume will be very similar to the american one. The reason given for the late change is simply a schedule change. So while it is disappointing at least we know 100% for sure when Korra is coming to the UK/Ireland. Now for some speculation. If the show premieres on July 7th then Book 1 will end on September 22nd assuming no breaks. This would fit pretty nicely into  Book 2 perhaps in airing in August or September (just pure speculation here) All of this info comes from NickALive