We have some more details on this now thanks to BigBadToyStore.com
who now has this set up for pre-order.
An Icon Heroes Release! Designed and sculpted by Art Asylum! The Thundercats are back in an all-new, Previews-exclusive box set inspired by the classic TV-movie ThunderCats, Ho! This time, the newly discovered Thunderians take the spotlight, as Lynx-O, Pumyra and Bengali face off with the evil Ratar-O! Each Minimate stands 2 inches tall and includes a variety of interchangeable parts and accessories, and this set also includes a non-poseable figurine of Ro-Bear Bert!
today announced a new ThunderCats's Minimates boxset in the works. They haven't released any details other than to say it will include Pumyra, Lynx-O, Bengali and Ratar-O! The image they included also shows one of the Berbils.
It's unclear if these will be offered through Icon Heroes like the previous 3 waves of ThunderCats Minimates or not. We will update as we get more details on these.