Halo 4 Beta for Microsoft employees - Underway?

I understand, from unofficial sources, Microsoft employees have been playing a Beta version of Halo 4.

The rumours indicate it is a February build. I not do believe it would be that old of build but it is interesting nonetheless.

I believe the 10 minute video of leaked video I posted was likely a by-product of that Beta.

One more week to E3 and many rumours will be put to bed. At that point we'll be at a whole new level of rumour mongering.