Halo: Reach details and screens leaked?

This morning a few screenshots of the much anticipated Halo: Reach have been appearing over the net.The screens first popped up on the MLG forums but have since been removed with Neogaf, following suit on their forums. Speculation about what is in there is rife and has also seen Bungie coming down hard on people even mentioning these shots which adds credibility to the story itself.
The shots themselves seem to have come from an internal beta and the information has come from the man who leaked the screens by also saying “Overall gameplay was about the same as the other Halos… They made me play through the first 3 missions. The first mission was on a pretty big map, and I had to find other spartans on the map (similar to Halo 1′s second stage where you have to find the crash landed marines).
“Second stage was pretty action packed, main goal was to take control of several huge missile guns throughout the map, and provide coverage to a spartan that would hack into the guns and control them.
“Third stage was very similar to Halo 1′s 3rd stage, Truth and Reconciliation. You start with a sniper and cloaking perk, you sneak into an enemy base at night, and you shoot from cliffs.”
Another interesting comment is regarding a Call Of Duty style perk system with shields and health for all the spartans too which could add depth to the game.
We are awaiting for an official comment from Microsoft which will probably go “We do not comment on rumour and speculation” so we will keep you updated as things develop.
Check out the screenshots here.