Pong Krell could be a great candidate for a Battle Pack with some Clones, that way he wouldn't be in a line that seems odd choice for him. Though I'd still buy him as a single figure, I'm just thinking this avenue would take up a slot in the basic line. Not to mention retail would likely be interested in a Clone BP with a Jedi, rather than some "unknown" character in the line. [I]We already know that retail chooses characters they want.[/I
Spider Maul would likely have to be a deluxe figure line, or a Battle Pack as well. While he still is a popular character, and would likely fit on the card. His "extra" Spider legs would have done better in TBS packaging as an accessory. Personally I wouldn't be interested in a Spider-legs only option. And with him being in a Battle Pack, it opens up "other" figures such as Proper Mother Talzin, Bo-Katan, or Satine Kryze etc.