I can only give you a few aspects of the cabin changes as thats my area. I've not actually flown an ETOPS route yet but some of our 752s are equipped (its most of our older aircraft that are ETOPS from the days of the good ole trans-atlantic charters
The emergency exit slides will be replaced with Sliderafts which come complete with an erectable canopy and basic survival pack (puncture repair kit, water purification tablets etc...).
Liferafts will be carried as well, although all the aircraft have the appropriate stowage that doesn't mean they will be fitted.
I don't know if its a requirment but Survival packs are also added, these are just placed in overhead lockers near to the liferafts. These should contain;
Knife, whistle, canopy, sponges, a cup, torches, sea sickness tablets, boiled sweets, 1st Aid Kit, Hand pump, water packs, water purifing tablets, signalling mirror, sea dye tablets, canteens and a signalling mirror. Oh and of course booklets entitled "Immediate actions and features of sea survival" - I kid you not
Lifes a train racing towards you, now you can either run away or grab a chair & a beer and watch it come - Phil