Urgh - that sounds really painful - your poor DS. Mind you, it sounds like it won't be so complicated surgically; it's where things have gone right into the eye and damaged the bakc of the lens capsule that it gets more awkward usually, so it does sound like there's a good chance they can get good results.
I thought of a few more things;
I notice from your profile you're in England; your DS will need glasses that have a bifocal or varifocal lens in that eye (the artificial lens they put in is rigid so it can't focus like a natural lens and neither can a contact). If he has an IOL at 6, they should be pretty thin glasses, so not unattractive. Bifocals have a line, but are easier to get the fit right on a child which is very important. In Wales you can have varifocals on the NHS so you might be in for paying for the things once he's old enough to care what he looks like and doesn't break so many pairs of glasses. You may also find that your DS may not see so well in bright sunlight with his affected eye - watch out for it 'cos they usually forget to tell you. Scarring on the cornea and after the cataract surgery causes scatter and means you might find he needs prescription dark glasses - these should be available on the NHS, but you have to fight tooth-and-nail to get them in some places.
Some parents in the US use sports goggles etc, especially if vision in the affected eye isn't so good in the long run - the lack of steroepsis makes clumsy injuries more likely and they're more concerned that nothing happens to the 'good' eye. Others feel that's over-cautious.
Your DS will need regular eye pressure checks afterwards for life as the surgery can sometimes cause glaucoma - but the risk is not too high for a 6 year old and it's just the puffer test they do. If his other eye's OK he should be able to drive, whatever the outcome with this one.