There are way too many changes to list here but the following is a small snippet of changes, see Dulfy link for more information:
Tempest
http://dulfy.net/2015/08/17/gw2-tempest-changes-based-on-bwe-feedback/
All overloads are at least 20% stronger than before.
Overload Water – Increased the amount that healing power affects pulsed healing by 400%. Increased the final heal value by 50%.
Several warhorn skills damage has been increased by at least 20%.
Dragonhunter
http://dulfy.net/2015/08/17/gw2-dragonhunter-changes-based-on-bwe-feedback/
F1 Spear of Justice: Increased range from 900 to 1,200. Increased impact damage by 20%.
F2 Wings of Resolve: Increased heal value by up to 50%.
Traps were buffed and traits were buffed as well.