I suspect that phase 2 will release in the next 45 to 60 days and I as far I can tell there is not a good reason why Diremaul should be released now.
For those very few people that want Diremaul released cause they feel like they have ran out of content to do, I find it very hard to believe that Diremaul will provide more then 24 hours played of content for these people. And it only seems to me like it will make the average player base mad.
It only seems like a bad decision to me. People can wait the 45-60 days for Diremaul to be released with phase 2.