Super IPS+

Dana Wollman, Engadget, on the ASUS Eee Pad Transformer Prime Nexus Super Plus Extra Special:

In addition to those basic specs Mr. Shih revealed last month, we now know this has a 1280 x 800, Super IPS+ Gorilla Glass display with a 178-degree viewing angle and a max brightness of 600 nits.

What in the world is Super IPS+?