June 30th, 2007 it’s going to be. Session proposals are not accepted yet, that is planned for March. I expect sooner or later there’ll also be an “official” announcement on the DDD web page, so this is just a first heads-up.
One thing that was first tested at DDD 4 were the grok talks in the lunch breaks, and as they were a great success, the organizers are planning to keep them up. So if you’ve never spoken at such an event before, and a 1 hour sessions seems rather to you, consider coming up with a good grok talk topic and try things out in an informal setting.