Well the dream would be a event monthly, but I have a feeling that as of right now we won't see any kind of full affect of that till a lot more events start to release. Assuming that there is going to be a new event when 2.0 comes out, I think its going to be safe to assume that it will switch off between the new event, the gree event and rakghoul event, with brand new events being added into the mix every so often.