The first post tackles guilds and WvW. ArenaNet aims to unify guild chapters split across home-worlds so that all members contribute to and benefit from the same version of the guild. But the studio does note that WvW won't be negatively affected by megaservers and will continue to be based on competition between worlds.
The second and more meaty entry focuses on world bosses and events. The API governing boss timers on individual worlds will be replaced by a more consistent schedule such that world boss events will start at the same time across the entire game. There's even a 24-hour proposed schedule ready to go.