I got a little more experience in the revamped Zul'Gurub this week on the patch 4.1 PTR and have returned in triumph (and toting many a repair bill) with a comprehensive guide to surviving one of two new Rise of the Zandalari heroics. This guide should help you avoid the dungeon's knottiest problems as either a bear or a tree, although I've had to be less specific than I would have liked. Turns out that most boss abilities aren't up on the PTR version of Wowhead yet, and while tanking or healing, most groups frown on my tabbing out to record exactly how much damage stuff like Breath of Hethiss does ("Would you say that 26,000 damage per second is too much, not enough, or just right?").
(Cats and moonkin, I'm very sorry, but I'm not sure what DPS does. It's been my experience that bosses drop dead for inexplicable reasons, whether it's congestive heart failure, bad oysters, or old Sicilian curses. DPS is involved in some hazy manner here, but damn if I know how.)
Keep in mind that I've pugged all of my groups on the PTR, so any estimates of the content's difficulty will necessarily be colored by that. If you're going to do the new ZG with guild groups on the live servers (particularly if your guild's outfitted in tier 11), you probably won't be as worried about some of the issues I encountered.