Halo 4 grenades?

Has anything been confirmed about grenades in Halo 4?

I really hope the frags are like Halo 3 rather than Reach’s. Reach grenades seemed to be slow moving and couldn’t bounce for crap.

I also wouldn’t mind seeing spikes and maybe fire bombs return.

slow moving yes but they were pocket nukes, i agree that they should be like halo 3 however.