This is official now, so no more rumors on Tyranid releases. the pic above were released by GW.
This is a decent sized release this time around. While we still have very little release information about what is actually going to be in the codex. I expect we will start to get that information as next week unfolds.
via Games Workshop
Codex: Tyranids Limited Edition $100.00
Codex: Tyranids $49.50
Tyranids 1-Click Launch Collection $323.50
Harpy / Hive Crone $80.00
Haruspex / Exocrine $73.00
Hive Guard / Tyrant Guard $70.00
Tyranid Warriors $51.00
Tyranid Swarm $170.00
Carnifex Brood $90.00
Termagant Brood $44.00
Hormagaunt Brood $44.00
Tyranid Predation 1-Click Collection $1,533.00
Jes Bickham's Hive Fleet Eumenides $842.25
The Living Fortress $247.50
Warhammer 40,000 Psychic Cards: Tyranids $6.00