5 & 4: This exists just wasn't shown in the beta (hint: find the destiny database dump) 3 & 2: The only difference between the new system and Halo's is that instead of having difficulty levels (Herioc, Legendary) they have numbers. Everything we fought in the beta just taped out near the top of a Halo "Normal". The AI does get harder and has better tactics (Alpha "legendary" strike comes to mind) 1: Space ship flying in to drop you off better make it into the final game - joining a fire team in explore is kludgy without it.