"Beta in the summer," Englund quickly responded. As for how the beta will work and who will get in, Englund says "that's still being decided" by publisher Paradox Interactive, and that more would be revealed later.
Another question I had was in regards to controller support -- Magicka on the PC is compatible with Microsoft's Xbox 360 controller, and when asked if The Showdown Effect would support it too, Englund told me that the earliest testing on The Showdown Effect was done with controllers. "The first months of development we actually only used game pads so, yeah, it should be in there," he told me.
The Showdown Effect is currently slated to launch "when it's done -- in 2012."