According to the box images, the two new cereals will come in Caramel Crunch and Thin Mints varieties, the latter being a truly innovative flavor for cereal. The cereals are obviously take-offs of cookies. It also appears these will be limited edition.
The big question is whether these cereals will be sold in stores or by the Girl Scouts themselves. We'll be watching for more details, so that we can try them!
UPDATE 10/24/16: General Mills confirmed on Twitter that these cereals will be arriving in January.