For those who haven't heard it yet the next release of NetBeans will be 6.7. So the planned M2 release coming out this week is 6.7 M2 now. The main reason mentioned in announcement follows.
To get innovation and quality improvements out to the community faster,
and to have the NetBeans IDE be better aligned with the release
schedules of other technologies that it supports, we have decided to
concentrate on a series of smaller releases rather than the traditional
two big releases per year.
You can get more info abot release plan and features in the official announcement.