The demo version that was promised in Barcelona has already been presented? Or not yet? This link
I haven't seen the official announcement. But can be in chat wrote about this. This people wrote that will show something new. But the announcements from the developers I have not seen about this.
Strange, the other day the topic discussed the moment that the official site of the project already has a link to the demo version of the platform. They said that there are even 2 games you can test. And today I read that everyone is waiting for the beta version of the platform to be launched.