...
- Game release at a new platform
Things that do not matter for the decision
Localization
A different language usually doesn't matter, as these are documented otherwise, but see one exception below.
Patches / Updates
Only full releases can cause a new RG.
Special releases
A new RG is caused due to gameplay differences, not due to a fancy new box, a voluptuous manual, additional goodies, or other stuff.
Things that count pro a new RG (Pros)
Major pros
Minor Pros
Things that count
againstcontra a new RG (Cons)
Major Cons
Minor Cons