I know that Lucas has been in talks with the kid who played the young Boba Fett to continue the role. From the sound of things, they're still planning to make Boba Fett a major character.
Which is awesome.
It'd be hard to have many Jedi in the series, as the show will be set in the twenty years between Revenge of the Sith and A New Hope. And at the start of A New Hope, there should only be a few Jedi still alive (Obi-Wan, Yoda, and very few others).
But they can easily have one or two Jedi in the series (Aayla Secura!!! No one saw the body!!!) so long as they die before A New Hope.