No real spoilers here, just some observations.
I checked out some of the newly opened Jade Forest zone last night. I didn't get to do a whole lot since the beta server crashed.
While having gigantic pets was fun for a bit, I went to the stables to swap my Krush and Chromaggus for some smaller beasts. When I did, I noticed that 5 of my slots at the stablemaster were empty. At first, I thought maybe this meant we were getting more slots, but then realized I was just missing 5 of my pets. I'm not sure which pets they were. When I tried to drag one of my five pets into one of those empty slots, I got an error message indicating the slot was locked. Weird. I put it down as another beta bug and swapped out Grumpy and GIR for a raptor and wolf (Takk and the Lone Hunter). They were still 'wild' sized, but at least I could actually *see* what was around me.
The intro quests/videos shown on WoW Insider and elsewhere aren't in place yet. Speaking to a Pandaren outside Garrosh's building just gives the option to teleport to either the Horde starting point (actually, to a spot a way south of it), or a temple in the middle of the zone. There are currently portals back to Org from both those places, but the one at Hellscream's Hope doesn't work. I dunno about the other one.
The most interesting beast I ran across in my short visit was the new tiger skin. I really like it. I also kind of like the turtles near the Horde starting area. The other beasts I was able to find were standard skins of bears, owls and talbuks. Unfortunately, none of the beasts are tameable yet. I imagine that'll happen in a later beta patch.
The taxi's are kind of cool. Leaving from the Horde base, the flight was on a standard wyvern. From the temple's flight point, it was a big kite with a lantern on the back.
Questing was tough just due to the large number of people there. The Horde ones consist of some of the "Kill a bunch of these guys" and "Gather 8 of those things" Nothing too difficult, unless there are 20 or more people all around trying to do the same thing.
My UI and talents make things a bit more challenging too. I really miss my macros, bar mods and other quality of life addons. I've got abilities spread all over the action bars and I resort to clicking some things. My talents are kind of all over the place as I've tried some of the new ones.
The one that gets to me in a bad way is graphics related. There's nothing wrong with the zones or anything. They're beautiful. What bothers me is that everything has a rather strong golden lighting effect to it. I'm sure it's a setting somewhere, but I can't find it. It makes things look as if it's late afternoon and there's a bright, almost harsh, pre-sunset light on everything. It kind of bothers my eyes. Since it occurs everywhere else I've gone (Orgrimmar, Mulgore, and Thunder Bluff) I figure it's some global effect. It gets to my eyes after a while.