This is a sit/stand desk. It is designed to change heights when you want to stand up or sit down to work. They usually have a memory so you can switch easily between the two.
It is actually becoming fairly common as we are now finding out that sitting all day is actually bad for your health. People are now using these to stand up for a portion of the day to work to help with back problems and such.
I wanted a sit/stand desk for my home office setup but as awesome as this one is, I just can't stomach nearly $3k for it no matter what nifty tech is with it. I could buy an equally awesome (minus the techie stuff) desk from Ergotron for probably one fifth the price of this one. It's a nice desk, no doubt... but not $3k nice.