Sorry if this isn't exactly a frequent flyer question....

I just booked a frequent flyer ticket for travel from BOS to NRT, via EWR. Can anyone tell me what service to expect in coach class on the EWR-NRT flight?
Specifically,
- What does the seat-back entertainment consist of? Can you watch a couple of channels, or are you stuck with what they decide to show, when they decide to show it. Can you pull up the in-flight route map even if there is a program being shown?
- When are the meals served and how many are there?

Thanks a lot for the help!

Kilarney