Check out the webcam at
www.425parkave.com
Just scroll down to the bottom of the page, it's already almost as tall as it used to be, and will be getting its first bits of curtain wall sometime in June, apparently. Your favorite tower is in good hands, I'm happy to see that its reincarnation is finally coming along so well, after seemingly going nowhere for so long.
(In actuality, a lot of work was going on inside the building that wasn't apparent from the street, like installing temporary wind bracing among many other things)