1736 Dec 25 calls already traded (82% at the ask) vs. open interest of 295. Premiums are up 20% to 25 cents. The market is pricing in a 16% rise in share price by Dec 18.
The Nov 22.50 calls were also active, with 2003 contracts traded vs. open interest of 502, and premiums are up 85% to 55 cents.
Seems like there's some truth to the rumor: http://www.theflyonthewall. com/splashPage.php?action=main&arg=A