The fourth Humble Indie Bundle was arguably the best yet, so it's no surprise that they'd do another one—though we weren't expecting it so soon. The Steam registry's got a listing for "Humble Indie Bundle 5," though Humble Bundle Inc. has reportedly told one Steam forum user that it's simply an error on Steam's part.
They also said they are working on another bundle, but not to expect Humble Indie #5 any time soon. What indie games would you like to see in a new bundle? Bastion? To The Moon? Any PC exclusives that you'd like to see ported to Mac and/or Linux? Let us know in the comments or on Twitter.