Currently the Uffizi is in the midst of a major transformation. The project is known as the "Nuovi Uffizi" and has been underway since 2006 (if my memory is correct). There are several more years of construction ahead and when complete most of the museum will have been restructured and/or restored.
There is a website dedicated to the project here. We'll also be bringing you news and updates here as things come more into focus.