One of the central figures in Fringe’s mythology may have finally been cast. Read on for the spoilery details about Mr. William Bell.
According to various sources, Leonard Nimoy WILL play William Bell in the Fringe finale – and what’s more, expect Bell to somehow connect with Peter Bishop in a strange biological way. Here’s the first official blurb:
Look at J.J. Abrams using his fancy sci-fi connections.
After collaborating on his upcoming Star Trek reboot, Abrams is close to bringing on Leonard Nimoy to play the pivotal role of William Bell on his Fox baby, Fringe.
Although Nimoy has yet to sign on the dotted line, a Fringe insider says “everyone’s optimistic” that the 78-year-old Trek icon will be the one to play Walter Bishop’s former lab partner-turned-millionaire founder of Massive Dynamics.
Source: Ask Ausiello

If this is true – Fringe just took the next step towards it’s place in the si-fi pantheon.
Amen brother. This is so rad.