AGFRAG, the team that announced Bob Ross: The Joy of Painting back on April 1st of this year, has posted a short message on their Yahoo groups page. Unfortunately, the game based around Bob Ross's career has either shifted hands, or more likely, been canned. Here's the message:
AGFRAG is no longer involved in the development of ANY Bob Ross Game. Please contact Bob Ross Inc. for further information.
Thank you.

So, everyone looking forward to painting happy trees, using your Wiimote, with Bob, will sadly have to settle for digging up tapes of the show and doing some real life paining.

For those interested, you can contact Bob Ross Inc. at info@bobross.com to see if you can't get any additional info out of them.