I believe because the amount of people that are doing this project aren't as many as needed to make the task in the provided date, they may be overwhelmed as the next update brings loots of features. A delay is reasonable as the coding may bring bugs which can take lots of time to fix . Many developers and companies delay updates and releases because of some major bugs or the amount of features which may be too many to manage for a period of time .I see how you may be upset but you can be sure that GreatSaamo and the other developers working on this project are doing their best to release the update as soon as possible :)