Sure, it's going to keep the old and the new in a well-balanced mixture, but I'm honestly expecting more instances of hearing older music from the ALTTP soundtrack, just revamped and remixed. Below are the parts of the game where I predict the music will be used in.
Areas of the game where the older music would be more prevalent
-Overworld/Dark World
-Key Nostalgic Zelda themes (obviously)
-Boss Music, I can see being used like this as well.
Newer Music
-New Boss Themes (If any)
-Dungeon Music, especially. In the older games, like ALTTP, the music was always the same for each dungeon. (Light world/Dark world, respectively.)
- Perhaps if there are new locations to be discovered in the "Hero Defeated" Arc World, I can see new music to be utilized there.