TV Show Canonicity
Recent article on the possible direction the live-action show might take
George Lucas is reportedly very involved in both new series, and is said to be going over all the scripts and giving notes. Collider says that within Lucasfilm both new series are considered official Star Wars canon, unlike the majority of "Expanded Universe" stories. One way that will be reflected is in the portrayal of Jedi, who will not be as unstoppable and superheroic (in terms of abilities) as they were portrayed in the earlier Clone Wars shorts, but more in line with their powerful but far from invulnerable portrayal in the films.
It's still early to say whether the TV-Shows are canon or not, but this certainly sheds a little light on the matter
.... and it also says that both Showtime and HBO are strong contenders to air the show....