Please remember that these are still rumors, as nothing official has been announced. I included the first set of new releases here as well, so that we can see the tyranid release all in one place.
Tyranid Limited Edition Codex $100 £60
via an anonymous source on Faeit 212
There are more releases coming, but these are online or mail order only.
New Releases January 11th
Codex Tyranids: by the Games Workshop Design Studio $49.5 £30
Tyranid Psychic Cards $6 £3.5
Tyranid Harpy/ Hive Crone $80 £48
Tyranid Haruspex/ Exocrine $73 £44
Tyranid Warriors (3 models) $51 £31
Tyranid Hive Guard/ Tyrant Guard (3 models) $70 £42.5
Carnifex Brood (2 models) $90 £55
Tyranid Swarm (95 models) $170 £105
Tyranid Limited Edition Codex $100 £60
Tyranid Termagant Brood (20 models-online only) $33 £20
Tyranid Hormagaunt Brood (20 models-online only) $33 £20
The following are mail order only.
Zoanthrope
Broodlord
Lictor
Venomthrope
Red Terror