Yes, Including pure form flood and juggernaut flood (a little throwback to Halo 2's unused model still hidden in it's code). I believe the explanation for these forms being present with only the keyes protogravemind being developed is that the Halo's are also designed to store flood specimen from the previous flood war.
And, This game has one of the flood from the pc verssion of halo ce. The name escapes me.... its the one with big tenticle arms that is a mini boss in raven. I appreciate that they added it and that it dose interesting things