Anyway, from the announcement:
I was wondering if we are going to be expected to pay for these frequent feature additions. Was there some notice I didn't see or get about what the upgrade policy is going to be?After final release of this version, we will be adding features frequently to satisfy your demands, but for now we must ask you to focus on helping us make this foundation version the best possible product. After that, we will be asking for your suggestions on further features and improvements.