According to PCgameshadware.de "Ice & Blood" add-on for Sacred 2 will have extra hardware accelerated PhysX content. (:: Link
It's uknown, however, if new types of effects will be added or just all-known from Sacred 2 will be keeped, like dynamic leaves and rocks.
On recently released video trailerhttp://www.youtube.com/watch?v=09-JqEtcwcc
you can spot some particles and leaves.