I am eager to see a video about the ways to use this feature and have some more information.
Apart from stem separation the new Version, and that may be different for many users, isn't attractive enough to upgrade.
The PlugIn however may be a good reson to spend some money.

As for the Stem Splitter - I do have some (expensive and free) and one is part of Studio One. So I do have separat stems from the Songs I would like to sing along, sitting ready to go within my DAW. (You may notice, I do not wish to keep the Vocal, but to get ride of it.) Most cases, I do have the original recording as my backing track. In a few cases, I wish to manipulate it. Changig something or adding to it. Again, this is something I can do with the tools available.
Using the Stem Separation within Studio One is giving me the chord progression, the Tempo Map and what not.

I cannot see how I would benefit from Loading my song in BiaB instead of Studio one. With the PlugIn I could use Band in a Box Features in my DAW and add Real Tracks if I see a need.
Is there something I am missing? Something I do not see yet?

And, by the way - the end result I want to have is a sort of Karaoke Video with Lyrics showing up in proper time. Again, I can do this today, but maybe Band in a Box has a better way. That would be another incentive to upgrade.

“Musicians”: UltraPak 2025
DAW: Studio One Pro +
"Instruments": VSTs and REs
Notation: Notion 6
Interface: NI Komplete Audio 6
Mic: RØDE NT1-A
Controller: Panorama P6/KAWAI VPC1/Atom
OS: Win 10 64 Pro