The people that made the video? Yea they annoying, if they do that on purpose, don't, if that's their normal voices, dear lord.
The main things I'm looking forward to in 1.4 are the new fences, item frames, flowerpots, dynamic stairs, and of course, decorative skulls. Could care less about the new mobs.
Beacons would also be useful for some nice effects in creative, but more importantly, perks in survival
Pre release out, hopefully this means bukkit can get a few days headstart http://www.mojang.com/2012/10/minecraft-1-4-pre-release/
The bukkit team is now part of mojang, so it should update very quickly. However, the plugins we use will probably take a few weeks. (per usual)