According to writer, creator and Avengers director Joss Whedon, the CW has picked up the three-part, musical traicomedy starring Neil Patrick Harris, Nathan Fillion and Felicia Day.
Whedon made the announcement towards the tail end of a panel for Dark Horse Comics (with which the Dr. Horrible creator has collaborated on a number of Dr. Horrible titles). The program will air on the network sometime in 2013. There's no news yet on the exact day, timeslot or if Whedon and company will film new material for Dr. Horrible's television premiere.
Whedon recently revealed that a "bunch of songs" are already written for the next iteration of the Sing-Along Blog. It's just a matter of finding enough free time to make those songs part of a fully fledged production.