Tokina announced their previously leaked 16-28mm f/2.8 AT-X Pro FX zoom, which will be released in early August in the Nikon F mount. Like Nikon's 14-24mm, this is a big, heavy lens (slightly over two pounds) and can't use filters due to both the large front element size and the built-in petal hood. Likely price will be in the US$1400 range. Other details are on the Tokina Lens Database page.