> System 57 or however its called

It's 54. See there for why that numer has been chosen:
https://wiki.amigaos.net/wiki/AmigaOS_Versions

> Emotion video player (I would love to see ported to MOS) [...]. [...] fixed
> Octamed non Studio and Personal Paint updated m68k. I wonder if these 3 pieces
> of software became available [...], should I buy them for my MOS machine

Emotion/PPC:
Nobody can seriously advise for or against buying it for MorphOS as long as there's no MorphOS version.

OctaMED v8/m68k:
It may run on MorphOS. I don't know whether anyone tried yet. Does it run on OS4?

Personal Paint v7.4/m68k:
The latest test on MorphOS I'm aware of was with v7.3b in 2016 (#73). I don't know if v7.4 has improved MorphOS compatibility.