What exactly these words mean is a little vague in some ways. Blizzard's already said that previous tier raids should be puggable, so perhaps Blizzard means to straight up provide a random LFR feature for lower-tier raids. Then again, it could be difficult trying to match groups of 10 to 25 people who have all defeated the exact same bosses in a specific dungeon. Maybe Blizzard'll just expand the Real ID cross-realm grouping feature to allow you to invite your Real ID friends to raid. That in itself brings up some interesting questions. Would we see raiding guilds with members on different realms, or would it mostly be a way to grab a friend when your usual tank is taking the night off to go to a concert or something?
Regardless of what Blizzard's plans are, it seems like we may see cross-realm raid grouping at some point in the future, maybe even in patch 4.3. Hopefully, Blizzard sees fit to elaborate on Zarhym's comment soon enough.
Brace yourselves for what could be some of most exciting updates to the game recently with patch 4.3. Look at what's ahead: new item storage options, cross-realm raiding, cosmetic armor skinning and your chance to battle the mighty Deathwing -- from astride his back!