Reports indicate that the Dell 4k 28" will be 30Hz @ 4k also :( The Lenovo Thinkvision Pro 2840m and Asus PB287Q have both been announced (60Hz @ 4k, US$799),

Reports indicate that the Dell 4k 28" will be 30Hz @ 4k also :( The Lenovo Thinkvision Pro 2840m and Asus PB287Q have both been announced (60Hz @ 4k, US$799), but you might have to wait a couple of months for release.