My wife and I will be flying NYC to DPS in a few months and I had a few questions about Korea Air, hopefully you guys can help

1)I'm sort of ADD and my wife describes traveling with me like traveling with a 5 yr old, if I have a good toy to play with I'm reasonably well behaved but left to my own devices I become intolerable after a few hours. In the interest of her sanity I'm trying to find out if Korea Air has refurbished all of their 747-400 fleet to include PTVs in coach class? And if so, can you tell me a little about what they offer? Movies, Games, etc?

2)same question as #1 except with the A330-300

3)I've read elsewhere that seats are assigned at the gate, is this true and if so is there anyway around it where I can carefully choose our seats in advance?

4)I've seen some mixed reviews on the Korea Air experience (i.e. food, staff, etc) but the consensus seems to be that its great bang for the buck, is this accurate?

thank you so much for your help!