Is the Didact evil???

Does the Didact hate humans?
At the end of the Halo 4 gameplay preview, it shows the Didact symbol with “an ancient evil awakes” written under it.

I thought he was like all forerunners, peaceful unless provoked like the Mantle teaches them. Or could the Ancient Evil be the precursors? Because we dont know 100% if they are dead because some evidence has shown they escaped to another galaxy