It seems that Nikon Türkiye accidentally posted the specs for the 12-28 online (google translate asobinet, nikon rumours).
As expected it's small, light, variable aperture, and has VR; but I'm surprised by the lack of any mention of dust and drip resistance (unlike the 18-140, for example), the 67mm filter thread (I had suspected the 12mm wide end was so they could match the other larger DX lenses with 62mm), and apparently a voice coil motor for AF like the 400 f/2.8? That last one seems like massive overkill for such a small lens - the whole lens probably weighs as much as the focus group in the 400 f/2.8!
If it really doesn't have dust and drip resistance I don't see much point in buying it - what's the point of a landscape lens that can't take a light rain?