That's an old article
It quotes MacRumors as 491 days since refresh as of today it's 622, so that was more than 4 months ago and still no news of an update from Apple.
I've been waiting since my cinema display died during that flurry of new display imminent stories early this year so I held off for the new version since I had an older 23" cinema in the closet. But as we approach WWDC, I gotta say if they don't announce an update I'm going with a dell or something as the wait for a TBD that's compatible with my year old MBP (magsafe2) is ridiculous.