For those that haven't been watching the SiN Episodes blogs:
"Now, with Arena mode, there’s going to be demand for new maps. Well, very soon, we’re going to be releasing a tools SDK to address that very issue. The SDK will feature everything a budding mod-maker will need to create Single Player or Arena Mode maps. I can’t wait to see what the community does with this, and what kinds of crazy maps will come out. I’m expecting some really wild Arena maps to come out very soon after we release this release.
Related to this, in order to help budding map makers and modders out, we’re going to be putting up a Wiki, where we’ll have all our “how-to’s” and strategies in place so that you guys and gals don’t have to pull your collective hair out trying to figure out how to set up and configure everything. Community support is a big focus for us, and this is one of the ways we’re trying to meet it."