It's a global weapon rebalance. Many weapons have been changed from what I understand and in various ways including damage, auto aim and range.
Unless, I'm mistaken, here are the changes to weapon balance (correct me if I'm missing something):
AR: reduced aim assist (great, thumbs up from me)
BR: decreased shots to kill to 4, reduced rof, kill time comparable to DMR (meaningless)
DMR: reduced distance at which reticle turns red (should alleviate some of the BTB complaints).
The AR change is great, but ultimately not a game changer by any means. The BR change is meaningless because it's simply replacing the DMR with the BR. It's not altering anything other than what weapon people will use as their precision rifle. Sure, the BR is now a 4sk, like it always should have been. Okay, but the kill time of the precision weapon group is not changing, which is what matters. They're trying to add variety to what weapon players choose, not change how the game plays. The DMR change is great for BTB players, but for everyone outside of that, it's pretty insignificant.
None of those changes fundamentally alters how Halo 4 will play. Again, I have nothing against them per se, just that they're insiginificant and aren't the game-changers they're being treated as. Precision weapons are still too easy to use, strafe speed is still to slow, and the slew of other problems outside of weapon balance still exists. What are we testing? Why is this being treated like its the beta for a new game?
So the balance tweaks that they just announced, that Bravo has been helping with, are not meaningful. Gotcha.
See above.