latest developer diary at the Lord of the Rings Online site provides a detailed rundown of the fellowing and quest log improvements that will be included with Book 13. The quest log itself will be getting a face-lift, but the proposed changes aren't just skin-deep. One of the handy new features will let you see which step group-mates are up to in a particular quest chain, and also if they are ready to hand in a quest (as noted in the diary, the constant spamming of fellow chat with quest completion status will be a thing of the past).
As well as these things, actually finding people to help with a quest should be a great deal easier, with a feature that will allow you to flag a quest with a new "Find a Fellowship" button. Other people that have the same quest flagged will be able to see that you're interested and easily get together. From what we can tell, it sounds like you will only be able to flag a single quest at a time, which is a little disappointing, but it's still an excellent feature.