The leaked price is apparently $1499, which makes it a pretty interesting option if they've kept the lens sharp at 15mm f/2.8.
Translated press release is here: https://translate.google.com/translate?depth=1&hl=en&ie=UTF8&prev=_t&rurl=translate.google.com&sl=auto&tl=en&u=https://www.tamron.co.jp/news/release_2014/1218.html
http://www.canonwatch.com/tamron-sp-15-30mm-f2-8-di-vc-lens-officialy-announced/
Translated press release is here: https://translate.google.com/translate?depth=1&hl=en&ie=UTF8&prev=_t&rurl=translate.google.com&sl=auto&tl=en&u=https://www.tamron.co.jp/news/release_2014/1218.html
http://www.canonwatch.com/tamron-sp-15-30mm-f2-8-di-vc-lens-officialy-announced/