Diggy's Game mod will possibly never be released, not because he want's to keep it to himself, more towards the line of progression. Even now there are many bugs in Diggy's server, and many innovations to a new and healthier game mod!
It's been 2 years, and it will possibly never be released.
This situation is also towards the line of Diggy's server going empty, who will be able to test bugs than? Who will build nice buildings, or have new ideas about how the mod could work? Once Iban's mod came out, there was many little servers and no big servers hosting the mod. In my opinion, id rather have a bigger, nicer server to enjoy the mod in.