With the release of GPG 11, Berserkers receive their first GPG archetype since GPG 1 (Hopefully we’ll get more than one every ten editions going forward). Meanwhile, Fighters hit the 12 benchmark, and alongside Warlocks are now tied with Marshals for the most GPG archetypes.
Time and creative energy, mostly. It's a long process. I started with the heritages, and just about everything I wanted from O5e is converted on that front. Cultures and backgrounds too. Now I'm looking at archetypes.