Randy Pitchford tweets a response to a question about whether players can expect more classes for Borderlands 2, considering the success of the mechromancer DLC for the role-playing shooter sequel (thanks nin). For those unwilling to read through his entire answer, the indication is that there is indeed reason to be optimistic that they still plan on adding additional characters to the game. For those interested in the nuance, here's an exact quote of his reply: "yes."