Slight Concern about trait expansion
Trait changes will only affect a single class. Depending on the tier you drop it in, you limit what other traits this can be combined with. Something improving warrior shouts in the line that already has a bunch of shout enhancers, for example, or putting a new trait into the GM tier, which deducts 30 points from your available trait points.
Adding a single new skill in GW1 meant you had to balance it against all skills from all … 10? classes.
I would imagine they are going to do it in small increments rather than the glob of new skills they did in GW1 (which usually coincided with new expansions, so they released a ton of new skills all at once and inevitably ran into tons of balance issues). Doing it a little at a time as well as offering it as a reward system rather than something you can happily skip to a vendor and buy will help alleviate some of the balance problems.
~Surrender fiend and you will get an easy death
~I could promise you the same…but it would be a lie…