Prometheans and Covenant Alliance Confirmed

I was just watching Ducain23’s video when he said that Destructoid mentioned that in a Spartans Ops mission that the Covenant and Prometheans are working together, but you should all know that Spartan Ops takes place 6 months after H4 campaign. So in Master Chiefs story will we be fighting the both Prometheans and Covies at the same time in a battle and also I noticed the Blue Promeatheans were getting shot at by plasma bolts so i am going to speculate that the Blue ones are indeed non rampant AIs. Thoughts? Link to video below.
http://www.youtube.com/watch?v=UZ-hb_1bkxk&feature=plcp

That movie angered a lot of people.