Well, the latest set of releases are now available from Privateer Press. There's not a lot this time around, but that doesn't make them any less important. Especially considering we're getting two warcasters and a brand new expansion book. Yeah, I'd say that, despite being only 3 things, it's a pretty big deal.
The book is the new Hordes expansion book, Devastation. This new book has new versions of various warlocks, new gargantuans for each faction, new units, solos, and warbeasts to go with all of it, new fiction, new painting guides, and new theme forces to tie it all together.
Other than that, despite being a Hordes book, the two minis being released are warcasters. Though "mini" is really sort of stretching it, especially in regards to the new Deneghra figure, since she is flying a big Cryxian dragon-thing. There's also a new Cephalyx warcaster with which you can turn your opponents into mindless drudges.
All of these are available now.