From posts on social media, it seems like there are three slow compilation albums that are coming out shortly:
Project Relax with Avraham Fried (Yochi Briskman production)
Hartzig with Shloime Daskal
Gefil from Shir Ve'shevach Boys Choir (they put out a good fast compilation "Simcha Mi'toich Simcha" a few years ago, seems like this is a slow counterpart).