Restive 'Downton Abbey' fans need fret no more: PBS has confirmed that Season 2 will (finally!) premiere in the US on Sunday January 8, 2012. The AP reports Paula Kerger, PBS president, as saying that the abrupt ending to Season 1 and the paucity of episodes -- there were only four -- led to angry phone calls from fans, many of whom worried that PBS might not even air a second season.

PBS also has good news for 'Sherlock' fans. The 21st-century twist on Conan-Doyle's deerstalker-wearing detective will start its second season on PBS on Sunday May 6, 2012. Alas, it's only three episodes long, but fans can be assured that it should be a case of quality triumphing over quantity.

Other gems from the PBS spring lineup include a two-part examination of Bill Clinton's presidency, a look at some celebrity family trees by Harvard professor Henry Louis Gates, and a series on American infrastructure, 'America Revealed,' hosted by winner of 'Survivor: Cook Islands,' Yul Kwon. More on these after the jump.

'Chuck'
(8PM, NBC) 2nd season finale
First of all, like many must-see-TV fans, we're hoping this is just a season, not a series, finale, especially since the episode ends with what 'Chuck' creators have called a 'game-changing' event.

Lest you think Chuck can relax and enjoy Ellie and Awesome's wedding now that the pesky Intersect is out of his head, here comes baddie Ted Roark (Chevy Chase) vowing to get revenge on Chuck and his papa (Scott Bakula), and promising to use Ellie and her wedding to do it.

Meanwhile, Chuck's still got some unfinished business to attend to with Sarah, he and Casey share a dude moment and Ellie may not be the only one walking down the aisle ... here comes the Morgan?