Why is Hasbro re-releasing certain figures again, like Ventress and Odd Ball? Are they due to be in Season 3, perhaps? Or is it simply because they've been outta circulation for so long?
The thing is though - Ventress hasn't exactly been out of circulation - she's in the TRU Clone Wars tin, with all of her original accessories and she's also in the Jedi Showdown (I think that's the name) battle pack along with Dooku, Anakin and Obi-Wan.
So my opinion on this is that she hasn't been individually carded in a while and they're looking to expand the new "Shadows of the Dark Side" line with as many figures as possible.
Look at Ashoka Tano - why is she still being packed with the baby Hutt? There isn't something else that she could come with instead at this point? Nope, of course not, that would mean that Hasbro would actually have to spend money to make something new for her to be packed with. And that would cut into the profit margins on the figure.