http://elderscrolls.wikia.com/wiki/Hircine%27s_Ring_%28Skyrim%29
"If you have already obtained and cured lycanthropy through The companions, A recent effect of patches 1.3 and 1.4 allow the ring to be used even after being cured."
Does anyone know if this is true?
Oh and does anyone know if the patch made dungeons darker?

I have not noticed the dungeons being darker. Is it possible that after 1.4 your game got reset to default brightness and gamma (if you changed them)? I have noticed that when I went to use various devices (Grinding Wheel, Enchanting Table, etc) I got the tutorial windows popping up like I'd never used any of the devices so some settings could've reverted to default.

As for the ring: I suspect the ring 'works' the way it's been explained ingame. That is it causes random transformations, but it didn't transform my chick into one during Ill Met by Moonlight.

Your gonna love my answer. i have 1.4. i have rolled one character and have been playing my own insane version of DID. No Hud No Fasttravel No Respawn. ETC. But i also have not done a single quest till lvl 48 except the main quest up to jorgen horn to get all three words for force push and your occasional radiant quest.
my only reason for this is so when i do quest the rewards will be at max level. So one of the first quest i do is ill met by moonlight. i strangly enough decided to side with singding and kill the hunters and the quest ended. i left the grotto to find hircine. hey uncursed the ring and it add a power in your menu that allows a transformation. so at the point i have completed the companions and have the ring i can change into a werewolf twice a day. i reentered the grotto and betrayded that annoying wolf. and for whateva reason also got the saviors hide.
at this point i went and did the totem side quests for aela gaining all three totems adding the brotherhood one. which gives you two spirit wolfs to fight with you. i then took farkas to be cured and did so for him. after the first wolf fight i decided to equip the ring and then started the fight to cure myself . i purged the wolf and checked my skill menu still have the ring equip still have the effect but lost original were power. test in room transformation and dual wolfs still work. strange part i swear but i will have to check it i stored the ring and i still have the power usable in my menu which is awesome i guess.

I know of nothing. Although the last patch ruined the werewolf armor. I hope they fix it in the DLC.

Whats werewolf armor?