Roleplaying, hardcore Raiding, running LFR on the occasional weekend, PvPing, rolling alts, achievement hunting, pet battling, or just enacting an endless series of whims, I don't care how you play WoW. Just as long as you have fun doing it.
I'd rather the zeppelin option.
Portals are boring, cliche, and honestly bad storytelling.
Also keep in mind the portal could be in Kalimdor, and the 5-mans tell the story of us getting TO Orgrimmar.
---------- Post added 2013-01-25 at 01:47 PM ----------
All the trash in the Valley of Honor (that's the one with Grommash Hold, right?) will be wearing various common transmog sets and be named "Loyal <Class>" they'd fight like that class, too.
FFXIV - Maduin (Dynamis DC)
In the 5.1 questline, we visit Dalaran, a Dalaran radically different from the Dalaran in Northrend. I think it will be like that. Org in Kalimdor will be 100% unchanged, but you will enter a portal/take an airship/ride a boat to Org under seige. The two Org's will not interact at all, just like the two Dalarans don't interact at all.