I've not seen anything from SLG. I'm subbed to the newsletter, but haven't seen anything. Just reconfirmed my sub though. Here's what I have this year...
The arcade version has been something I've loved for most of my life. I keep an authentic jamma pcb connected to my supergun + Sony PVM, or I'll stick it in my MK3 cab for a "true" experience.
Just for the sake of it, other MMC5 games work with this mapper fix as well.
I tested:
Castlevania 3
Uncharted Waters
Romance of the Three Kingdoms II
Laser Invasion
I'd have to even open mine up to test it lol, but I'm just assuming it's needed if it's telling you that it can't load it, and you don't have it.
edit: we posted I guess at the same time lol.
Mine has been pretty decent since getting it. I connect to my PVM using SCART > BNC. Haven't had any issues with it. I have a HAS pre-ordered and that will take over once it is here.