Dell never actually uses the term "4k" on the page, it's just in the title.

What are you talking about? It says "Ultra HD" in the description, which is the marketing name for 4K

http://en.wikipedia.org/wiki/Ultra_high_definition_televisio...

    "Ultra HD", would be used for displays that have an aspect ratio of at least 
    16:9 and at least one digital input capable of carrying and presenting native 
    video at a minimum resolution of 3,840 × 2,160 pixels.

This display fits those criteria.

I know. Was positively surprised actually, but that made the title even more puzzling.