Kirk Acevedo announced on his facebook page today that he was "fired" from Fringe:
WELL BOYS AND GIRLS THEY DONE DID YER BOY WRONG! THEY FIRED ME OFF OF FRINGE, AND I'VE NEVER BEEN FIRED IN MY LIFE!!!!
While this is not "officially" official, I have confirmed this with an inside source. Details are scarce at this point, but Kirk is likely another victim of the WB's cost-cutting measures. The move to Canada has caused quite a shake up on the show, with numerous behind-the-scenes people leaving as well. More info to come...
* Thanks to TheODI for the screenshot