For 1.008:
* In an effort to make sure you actually see the various items we worked so hard to make, and to make getting loot more exciting:
** Your base chance to get loot after winning a room is the same, but each time you fail the roll it goes up for next time until it succeeds.
** When room-win loot would give you a consumable item (as opposed to a minor item), at various intervals it will instead give you a main-weapon, energy-weapon, or power-up item. Those intervals are randomized but controlled to ensure some rate of each.
** When seeding from many of the significant item pools, the game's now fairly aggressive about not seeding the same thing more than once when there are still things that haven't been seeded. When it runs out of choices under this rule it starts over for that (group of) pools.
** When you open an unlocked chest, you have a small chance of getting loot from the locked-chest pool. If this roll fails the chance goes up for next time until it succeeds.
Thanks