Not all of it, but they'll only ever keep a couple of the battle tracks, Team Rocket's motto music, and the Kalos Route 4 theme (this is played whenever Clemont shows off a new invention). Every once in a great while they'll slip something else in from the Japanese version but that's about it.
It's annoying because they've left the soundtrack untouched before (a few Diamond/Pearl episodes like the Team Galactic three-parter and Ash vs. Tobias, the first five episodes of Black & White, the first two episodes of XY) but then it's back to business as usual. In fact when they rerun the first two XY episodes now they've shit them up with in-house music. And now the Diancie movie only used a handful of Japanese tracks even though the last 13 movies just kept everything.
I don't get why 4Kids was able to retain like 90% of the music in season 1 and now it's such a problem.
That's what I thought, too. It simply can't be all of it.
They were absolutely terrible in DP with preserving only 10% of the music sometimes, and it seems to be the same with XY. It's disappointing coming right after BW and how that preserved nearly all of Miyazaki's music.
Instead we got crappy fake Groudon, lego blocks and also starring Rayquaza and Deoxys, and Manaphy with Kyogre and Super Saiyan Ash
Hoenn region movies were pretty awful all around. Oh right, I forgot about the random Lucario movie.
The Rayquaza and Deoxys one was great. The advanced city served as a really interesting backdrop with the power outage.
It had that 'urban jungle' vibe that you get from the mainline Pokémon games, and I really appreciated that.