If there’s characters who have the same names as previous generations (like, if they have a Twilight Sparkle in G5, too), then we’ll have to figure out how to handle the names so people can search for the generation they want. Same thing for episodes or merchandise that might end up with the same names.
There’s a few ways to do that - the simplest is to just add (G4) Twilight Sparkle tags, like with did with G1, 2, 3, etc.
We’ve pretty much had to do some of this already with things like the My Little Pony Movie, to differentiate the new one from older versions with the same name.
We might add a “G4” tag to all the existing G4 artwork on the site to differentiate it from G5, so that people can search for “(G5 thing), -G4” and avoid anything from the FiM generation in their search for stuff from the new generation … not sure.
That’s a ways out though, so I’m sure by the time G5 hits the air we’ll have a plan worked out for supporting the new generation.