Not sure about TA, but my experience is that 95% of this is just about when the planes get bought. Entertainment systems solve the "keep people happy problem" for relatively cheap. But it's pretty expensive to replace all the seats just for that.
JAL/ANA have very new planes with cool entertainment systems, but they also fly their older planes on some routes with a bunch of stuff that looks like it's powered by VCR.
To your question: they probably don't for their major international flights.
