First review I have seen:
http://www.photographyblog.com/reviews/tamron_sp_35mm_f1_8_di_vc_usd_review/
£499 UK
£110 more than the Nikon 1.8g - not convinced its worth it, but will wait to see further reviews/samples and how much it is grey.
Its launch and to expensive imo, but nothing new, they all launch way to expensive in the UK market then drop swiftly. Id be interested in one of these purely for video stabilisation as Im already covered at 35 and 50 with ARTs.