Will it be fun or sucks? Rumour has it that...the new Spartan unit has NO SHIELDS! Yes, no shields. So you have to do more strategic than skills. Other than that, story line was based during the events of the ending of HALO 2 and the begining of HALO 3. When the covenants were still at Earth. More story lines weren't found due to bungie's 'ACT OF SURPRISE'.
Anyways, release date was told to be 9th September 2009.