Not sure if we're allowed to link to other forums, but there is a discussion about it over at guru:
Apparently traits will be tiered so that you will be forced to invest deep into a particular trait line in order to just unlock a trait you want (some traits will no longer be unlockable at 10 or 20 points, but only at 30).
From what I can tell:
At 10 trait points, you can choose traits 1-6
At 20 trait points, you can choose traits 1-10
At 30 trait points, you can choose traits 1-12
This means that if you want trait #11 or 12 you will need to invest 30 points into a trait line. In the last BWE, there was no restriction on when you could select a trait as all the traits were unlocked at 10, 20, or 30 points. This also means that you can't have both trait #11 and 12 in the same build anymore.
That seems like a huge step backwards for this game IMO as it greatly restricts what builds people are able to run. Let's hope this is short lived.
Same thing will happen to skills. You won't be able to unlock everything at the start, but that's not really an issue.