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.