IGN have just published a quick look at Guild Wars 2's Mastery System. Although it's not a hugely lengthy article and dubious title aside, we learn of three specific Masteries that we'll encounter:

• Mushroom Jumping (like Super Adventure Box or Skyhammer jump pads)
• Unlocking new Vendors in Maguuma
• Unlocking Collections and the ability to collect trophies to them

Other than that, there's a lot of repeated information here that was already learnt at PAX South. Fortunately, there's a few choice quotes from Crystin Cox, the Mastery design lead.

With combat, it’ll be more like a reveal like you might see in a game like Zelda where there’s a feeling like wow, I got this tool and now I remember when I was trying to fight this creature before I couldn't get past this one ability; this tool clearly tells me this is the key to that lock and now I'm going to open it. That feeling is one of the things we're really going: now I have more power, not because a number went up but because I can actually do this thing.

There's also a little bit of insight from Isaiah Cartwright regarding the creatures in the jungle.

We have some new NPC races in the world, one of them is the Itzel and when you meet them or start earning points in the Mastery System you can start learning some of their language.  By doing that, that might unlock things that you weren't able to access before, like possibly vendors or things like that.

Best of all, there's also an awesome new video highlighting Heart Of Maguuma. Take a look below!