Well, if there are going to be surprises, it wouldn't do well to tell you first. Of course, lack of surprises is also a strong possibility. Currently, there are about fifteen or so hostiles in the room, about the same number as allied soldiers. As well, there is strong evidence that more hostiles are going to be incoming from the second level. In this situation, they would likely  prepare to fight against guns, biotics, and tech abilities, as any of those are possible.