I'm kind of with the AC here. Not because of Microsoft... but those above Microsoft.
Putting my tinfoil hat on...
If I were the NSA and wanted to get around the current problem of current encryption stopping me from gaining access to other peoples communications it would be tempting to build a new system better than the current systems. As such here would be my requirements:
1.New Encryption system which to the user is better and faster than any other as far as the user is concerned.
2.I must have a master key to said encryption system which the user does not know exists..
3.User must have access to source code of encryption system to really believe their encrypted volumes are completely secure.
4.Encryption system is clever enough that even with the source code discovering the master key is exceptionally difficult - something like a complex mathematical problem which requires a super computer to decipher.
5.The new encryption system was to be distributed by another other than myself who was in some ways trusted but of course under our control.
To finish of my dastardly plan I would need to prove that the previous encryption systems were in some way fallible...