I assume they keep the various ilvls for different bosses in. This is going to be annoying when ie. a trinket drops with higher ilvl but worse proc for your spec. They need to equalize the ilvls again if they don't want daily whine posts on the forums about this once raiding starts.If an item that drops via personal loot is the same or lower item level than what you have equipped, it will be eligible to be traded to other members in the raid.
Either talents will be meaningless or raiders will change them for bosses. Can't really have it both ways. Just pick one and work with it.The team doesn't want you to feel like you should change your talents for every group of mobs or boss.