Well after running into these and trying them out I was thinking to myself, "this is nice but I wish that we got the damage bonus too.
Low and behold, what do I find in the 2.4 patch notes?
* Weightstones and Sharpening Stones: The bonus damage from these temporary enchantments now works while shapeshifted.
They read my mind. nice DPS increase for about 2g per hour. yep Feral druids just obtained a new flask.