In the beta, there were cogwheels and hydraulics for the engineering goggles, one socket each. Blizz decided to make them all cogwheels instead.
engineering helms can be disenchanted? umm wtf.... then why did they change the alchemy trinkets to not be disenchanted? seems kinda retarded................
I'd settle for just being able to use my Gnomish Gravity trinket, it has a tooltip that has piqued my curiosity, but as of last I was on PTR it still claimed that I was lacking Gnomish Engineering.
From what i know they scrapped the hydraulic sockets and made them all in to cogwheels.
while what wicker said is true (the costs of the goggles is way above what alchemiy stones cost), disenchanting goggles is the only way to make some profit out of engineering with chaos orbs (as the guns don't sell, but you need enchanting obviously).
The margin is decreasing now as maelstrom crystals are getting cheaper, but you can still make a few 100 gold on my server.