Currently, no. This was a pretty contentious topic. While it won’t exist in the initial release, it is also my hope that it gets brought back as I use this one a lot myself.
Edit: I will add a tiny bit of context here. The original work to mix these together was pretty tough to do since it needed to stitch together the EPGs (programming guides) from multiple sources. Since we have already done it once we know it isn’t impossible to do, but the new nav presented challenges on how to access a shared favorites list for LiveTV. I am hoping that we can figure out a way to bring this back and there are many people internally that want to find a solution here as well.