Just in case you did not notice, these are all armies for Armageddon.
Please remember that these are rumors.
via an anonymous source on Faeit 212
GW is planning a "re-release" of the 3rd edition Codex Armageddon! That will be a huge release for 40K "more than half a year away" according to my friend. It will include 5 supplements: Warzone Armageddon (scenarios), Supplement: Salamanders, Supplement: Steel Legion, Supplement: Ghazghull's Horde and Supplement: Orc Kult of Speed. Everything will be released in one wave.
Each supplement will be accompanied by a very limited number of new releases:
Salamanders - Special Terminator Squad combining Thunder Hammer and Storm Bolters (no shields). Has access to a special weapon that's a "pimped out mix of Heavy Flamer and Multi Melta"
Steel Legion - Griffon/Salamander combi kit, new Finecast characters
Ghazghull's Horde - Nobs in Mega Armour (Plastic), Orkimedes (Finecast)
Speed Freaks - War Buggy, Wazdakka Gutsmek (Plastic)