In the last news letter I received last week, where they confirmed the release date is the 23rd they mentioned bug fixes only for 1.0 and that they have a very long list of features to add for 2.0
So I expect no new features, maybe DLC's at some point after 1.0 release, or they might go down on a different path and we need to buy each release (2.0, 3.0..etc) to get new features and you get only bug fixes in between.
If there will be any DLC it is going to be things that they don't plan to integrate in to the core product and maintain for each release.
But I'm only speculating based on the very little info the devs shared so far regarding the release. Probably because there is nothing to share. For 1.0 they promised only a new rendering engine, a new IDE with new debugger and a level editor.
Everything else is pushed to 2.0 probably as suggested in the news letter.