Possible leaks in the network of test assemblies may be expected only close to the appearance of the first beta version of Windows 8 Beta-1 , earlier this term and the emergence of the network M1 , M2 , M3 should not wait. If both appear on the network Milestone assembly is not from us and our sources, this can only happen if a worker or group of developers will be dismissed from the company, and it is extremely improbable event, but rather "the land of the raid on the celestial axis ...
In other words, they don't plan on leaking any of the milestone builds. So we can expect a leak near the official release of beta 1 from Micosoft. M3 is supposed to begin in March, so a leak will probably happen closer to May now.
Also of note is that Microsoft is planning on releasing two betas before a RC.
Canouna (same one from this forum, and a well connected source to the individuals who are responsible for leaks) has stated that coding for M3 of Windows 8 will commence on February 28th. While it is a few days sooner than "Early March" every day counts for those of us waiting for a leak. The latest news on a scheduled leak is "around the time of the first public beta".
A reminder for everyone that we are currently in M2. M3 comes next and then after that is completed is the public beta.