I don't believe they will right away, BUT while many of the first generation Star Wars fans didn't like the prequels, many of the next generation of Star Wars fans do - I suspect as they mature (financially) Hot Toys will start making a small selection that may include some of those figures. Lets face it, Star Wars isn't going anywhere, only evolving, so Hot Toys will keep making figures... eventually anything is possible.
Howard is a big tease. But I wouldn't rule out getting one eventually (for the reason I mention above). Same with Queen Amidala, since Disney is targeting the female audience now big time. I think it will be a decade or two (again, wallets have to mature), but I wouldn't be surprised seeing one at that time.
Since they did Tarkin from Star Wars, I believe they will do Dooku and Grievous both... it's only a matter of timing, I don't see it happening for a few years but you never know.