From the ffxivcore interview:
In your letter, the blurb (Examination and implementation of changes to claiming and engaging enemies) was mentioned as well as in the players poll about possibly rewarding multiple parties for bringing a monster down - Players are worried this means the world will become "free-for-all", can you explain these in detail?

We're going to make a lot of bigger battles, where lots of players will be involved in these large-scale battles. In these large-scale battles there will be multiple parties on the field. If you have a system where only one party can claim something, then other parties won't even be able to come in and help. Or to get them to come in and help, you have to have another special system to allow them to come in and help, and it just becomes to complex. So we want to have a system where it's easy to have another team to come in and help someone that's maybe in trouble.

In the future there's going to be more instanced type stuff. With the more instanced type stuff there is, the less need you have for the claim system. Because you're going to have your hardcore players who have a lot, and you're going to have your players who don't play a lot as well, to give everybody equal chances to get into battles and do what they want to do. Having that claim system there preventing it is not something that we like. We'd rather for it to be more open.
From Letter from the Producer, V:
Player opinions are pretty evenly split on this one, and the regional breakdowns are varied a bit as well. I'm kicking myself for not having put in a third option combining the other two: Skill and experience going to all parties, and loot going to only the first party to deal damage to an enemy.

I personally think that this mixed option (skill/experience to all involved parties, loot to only the claiming party) makes sense. Well, the official FFXIV forums will be going live shortly, and I'd very much like to open this topic up for discussion there to hear your opinions. I'll be posting, too!
There are many posts like this, covering topics that have already been addressed and clarified in interviews and letters from the producer. If players but half the time they spend creating these posts to reading the provided information the forums would be less cluttered.