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It's 1250 points according to the newest Apocalypse book.
It is a bio-titan, related to the smaller Hierodule.
Dirigible Days - 2012 Hierophant Unbound 1-4 was released on:
USA: 11 December 2012
The tyranid Biovore is a matal model, hope it comes in finecast :)
Probably the Trygon/Mawloc, these tower above any other Tyranid in your army.