MadisonDining.com has the scoop.
I can't say I'm surprised. In fact, this is again something I've known was coming for a while, but my sources wouldn't let me cite them. Needless to say, it's been a long time coming as the quality there has decreased significantly in the past year. Strangely, I'm not ready to blame it on the brewmaster, ownership has been strangling the brewery for money for quite some time.
Personally, I gave up on the brewery side of things when they served their kristal weiss in an infected line, which made it intensely sour. I mentioned to the manager that it tasted more like a berliner than a kristal (not a good berliner mind you) and then, magically, a few weeks later they have a "berliner weisse" on tap. They did the same thing with the "belgian dark" that became a "sour brown" when too many customers complained.
It's a shame. JT Whitneys used to be good and the west-side brewpub will be missed. There are rumors floatin' around that "they" (there are some folks a part of Whitneys that will not be a part of the new brewpub) may re-open in a different location. Still up in the air whether it will be the same name or not.
Also up in the air is the fate of JT Whitney's non-brewpub spin-off in Oregon, Hawthorne's.