There'll be another sale during the livestream and simultaneous transition to the new and much-improved website on the 28th. They'll be offering the Avenger (yet to be revealed), revealing the Idris Corvette's concept art/model, and, it's believed, offering at least one other ship for sale as well.
In any case, the vast majority of backers—certainly the vast majority of active forum posters and chatroll participants, at any rate—enjoy these sales, ask for them, practically beg for them even. Both have been sales of variants of the two most basic ships in the game, and have brought in an additional $890,000 and counting (the 300i sale has brought in $188,000 since last night).
Chris Roberts said:
As always, we are doing these promotions as way to bring new people into the community – the Aurora promotion managed to bring in three times the amount of people to the game that were previously joining and almost 70% of the dollars raised came from new backers which was great! If you are an existing backer please pledge because you want to support the game’s development and our quest to make this the first fully community funded AAA game and not because additional ships are necessary for the experience. You will be able to acquire all of these craft and upgrades in the finished game using in-game credits.