With the Qui-Gon and Vebb orders, I sent in my request almost as soon as the order forms hit retail (or the web in Vebb's case) and I didn't have any problems getting the toys. If you wait till the last minute to order, you always run the risk of them running out.
Both the Qui-Gon and Vebb offers were excllent. One for a beast that really never saw retail in the US and one is not only one of the best Clone Wars figures, it's one of the best Star Wars figures Hasbro has ever done. It's no wonder they were popular.
When the Fett coupons hit, or Hasbro posts a PDF order form, my suggestion is jump on it within the first week. Even though it sounds like they've ordered more, this one has the potential to be really popular as well.