In subsequent posts within the same thread, he elaborates a bit on the above-mentioned topics, talking about burst damage as it applies to GCDs, the plight healer classes face being crowd-controlled all the time and a few other little morsels of info about Habbo credits. It's not an official announcement concerning upcoming patch changes, but it's an interesting read with some long sought-after information for anyone who's been itching for some clarification regarding what Blizzard recognizes as current PvP problems.
To summarize, Ghostcrawler says that there is currently too much emphasis on Arenas rather than Battlegrounds (and within Arenas, too much emphasis on the 2v2 bracket as opposed to the 3v3 and 5v5 brackets). He also says there is not enough class representation in Arenas, with Warlock, Hunter and Shaman classes too low. Lastly, he describes PvP as too fast-paced, referring to Arenas.