So it looks like the Holy Avenger and the Vorpal Weapon didn't change at all. However they are still decent magic weapons.
They stepped away from treasure parcels and went back to the random roll. You Roll a d20 once for each line of the table for the party's level (Not level of the encounter) So Typically you will roll once for Coin, once for gems, once for art objects, and once for magic items.
Here's an example, the treasure table for 6th-level characters looks like this:
(11+) 8d8x10 gp
(14-19) 1d4 gems worth 100gp (20+) one gem worth 500gp
(18+) 1d3 art objects worth 250gp
(13+) one magic item of level 1d4+6
You add modifiers to each roll based on the number of members of the party. For every group that has above 5 players you add +2 per player to a roll, for every group with below 5 you give the roll -2 modifier, and a nat 20 always garners the best result.
After having read the Harkenwold Adventure. Its pretty damn cool. Has quite a few cool elements in it. Good fights, Some decent skill challenges, and a really need way to handle the players helping defend a town under a massive attack. Lots of town and npc info, and side bars how to role play most of the major NPCs. Plus its got a neat Epilouge.
But how do you know which rarity to use? Are they always uncommons unless you feel like giving out a rare item? Is there a random roll to determine rarity?