Bell of Lost Souls has some, blurry, images of some of the upcoming Warhammer 40,000 Tyranid releases. The Toxatrope is sort of a wild looking version of a Malanthrope. The new Ravenors and Gargoyles are now in plastic but look rather similar to current designs. The new Hive Guard is a unique sculpt that is sort of Carnifex-esque.
New clear pics are now available and the models are available for pre-order from GW.