Kingdom T-Wrecks was expected to be a Target exclusive, and now a listing has been found, which says that it will be released in America on July 25th - it will be exclusive to Target Red Card holders, limited to 1 per customer... for us$50.
The product page isn't yet taking pre-orders, but shouldn't be too long, considering it was already released here, and Americans don't like to have "their" Transformers being released in other countries first.