gen 4 implies that there was a gen 3 (or some earlier version). the G43 isn't really part of a "generation". it's just a G43. at current time there's only one version. now if they develop a gen 5 version of the G43 i'm not sure what they will call the original G43 (perhaps Gen 1?).
also there's a button on the left called "caps lock". just an FYI.