On the podcast, Rodberg confirmed the upcoming implementation of Lua scripts: "We historically have not allowed any modding of the UI other than skinning it. Hope I'm not blowing anything here, but there is a Lua scripting project going on. I don't know if we've talked about it that much, but people will be able to do some mods. I'm not sure to what extent they'll be able to do it. It seemed like enough of our players were looking for this that we decided to do it."
Lua is a programming language that allows for the creation of add-ons and mods for MMOs, which has seen extensive use in titles like World of Warcraft. It allows for players to design useful (or not-so-useful) UI features, such as auction house enhancements, timing bars and even mini-games. While player response to this announcement is mixed, it hopefully will make many budding modders happy to hear.
[Update: Meghan clarifies: "It's not guaranteed for a launch with F2P - it may be in the testing stage for a while!"]