(edited by Cathbadb.6079)
Trait system manuals
If you had leveled enough to unlock a tier of traits AT THAT TIME, then ALL of those traits will be unlocked. However, you are still restricted to the current locking system PER TIER, so for example you won’t get t3 traits till level 80, but once you do, they will all be unlocked.
The exception is the new t3 traits added later. Those will probably still be locked cause they didn’t exist the last time you played.
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Edit:
I should have said trait manuals up to Grand Master are unlocked already (I didn’t buy them) but I don’t have enough trait points to even get to Grand Master in any trait tree, yet the ones already unlocked up to Master(according to the trainer ARE actually unlocked) but I can’t add any more traits in the Domination or Dueling traits trees.
You may find this informative: http://wiki.guildwars2.com/wiki/Traits
Welcome return, and good luck!