UPDATE: though i think the link above is still accessible, they took down the posting from the main page, which could mean...something?
UPDATE II: more here. this is kind of...sad and hilarious:
I just heard from Veronica mastermind and showrunner Rob Thomas, who tells me, "If we're cancelled, I certainly don't know about it."
And according to CW insiders, the CW has not officially canceled Veronica Mars. However, here's the catch: They are currently considering a different format for the fourth season. From what I hear, that format would leap four years into the future and focus on Veronica Mars as an FBI agent. Aside from returning star Kristen Bell (duh), the rest of the cast is yet to be determined, but it isn't likely that many of her current co-stars would be on board.
So bottom line: Veronica Mars could be: 1) spinning off into a new format, 2) returning in her college years or 3) getting canceled.