Sons of Horus Contemptor Dreadnought Repack
Forgeworld's Sons of Horus Dreadnought is currently sold out, but is coming back. So no need to panic. According to this, other Contemptor Dreadnoughts are most likely going to be re-packed as well.
via Lady Atia on Bolter and Chainsword
http://www.bolterandchainsword.com/topic/312901-soh-contemptor-no-longer-available/?p=4156862
The SoH Contemptor (and i think all others in the future) will just be re-packaged into a clampack - that changes also his code.
He isn't gone and should be available again soon