The official blog over at the Guild Wars 2 site has been updated with a new post from Isaiah Cartwright detailing August 6th's upcoming changes to Dungeon Rewards.
From the blog post:
To reach these goals, we’ve made a few tweaks to the way dungeon completion is rewarded. Moving forward, the full reward for individual dungeon paths will be on a one-day timer, making it more lucrative to run multiple paths than repeating a single path. This should also increase the rewards for people who only do one dungeon a day. Story dungeons will award 50 silver for completion, and explorable dungeons will award between 1 and 3 gold depending on length and difficulty. As we go on with our project of updating our existing dungeons, we’ll monitor the changes to paths and update the rewards accordingly.
Read the whole post over on the GW2 site.