. >>> when we come back tonight -- the big question involving a mçi >>> we're going to turn now to ourx" on a saturday night. what's trending this week. a big unanswered question about one of the longtime faces of late night. "the hollywood reporter" is quoting two high-level industry sources, saying that this could be jay leno's last year on "the tonight show." he would be replaced by jimmy fallon. if true, it comes after jimmy kimmel was moved to take on jay leno. in the report, nbc denying any such plan. >>> meantime, who's in and who's out on pbs' "downton abbey." trending tonight, shirley maclaine will be back. next season. >> dearest mary, you tell me all of your wedding plans. and i'll see what i can do improve them. >> maclaine will reprise her role. and maid sarah o'brien won't be coming back. she's leaving now to a new project. >>> and from buffalo, new york, a polar bear cub. the buffalo zoo introducing its new addition. barely three months old. the buffalo news reporting that she's being called luna for now. but there be an official naming contest to come. >>> if something