3.1 and Exp question

[Sove92]

While they haven't given a definite answer to whether or not 2.x content gives you exp past level 50, they have confirmed activating the expansion will immediately raise the level cap.

"Once you register Heavensward, the level cap will be increased and you can start to earn experience points. You won't have to complete any special quests."

you can get xp from anything, except lv 50 dungeons, until maybe later.
big patches usually come 3 months between each other, give or take a few days/a week.

Technically they do give exp, as spiritbind and gear wear are based on exp gain, though SB has content level conditions as well. You just don't see the exp gain, because you are at the cap.