I also realized something else as I keep watching these videos... This could easily explain why the game lasts until 150%+. In Melee, we could Melee spam our KO attacks until it actually kills them. But in Brawl when people do that, they end up not being able to kill them anymore because of the drastically reduced knockback. This could make the game MUCH faster, and bring the tournaments back up to 4 stock once people learn to save their KO attacks until damage is racked up. Wow. Then throw in the possiblity of comboing better by purposefully doing this on weaker attacks. Assuming this is true... Ryoko, you may have discovered the most important aspect of Brawl so far. To the extent that it'll change how Brawl itself is played.
Why isn't this topic like 20 pages already? We need some people with Brawl to run tests and see if this is real, and if so, how drastic the knockback reduction is.