We had the opportunity to chat with Albert Penello, senior director of product planning at Microsoft this afternoon, who was kind enough to clarify a few topics for us regarding the recently-unveiled Xbox One. One thing we were quick to ask about was the integrated storage. 500GB sounds like a lot today -- but so did the 20GB unit in the original Xbox 360. The HDD there was, at least, replaceable. Can you do the same with its successor? Sadly, no. Hard drives in the Xbox One are non-user-serviceable, but Penello confirmed that the USB 3.0 port is there for external storage, which can be used for everything the internal storage can be used for. That includes game installs and downloads. So, don't fret: adding storage will be just as easy as ever.

The new 1080p cameras are a wide field of view, which we saw in greater detail during the Skype demo with four chat partners, and looks great, but no one's too concerned about that.

The truly impressive stuff, though, comes from the brains of the Kinect. Its improved skeleton mapping is crazy accurate, and can track your individual hand motions and shoulder shrugs. The muscle tracker is also borderline ridiculous. It can tell what parts of your body have pressure on them. It knows where you're putting your weight as you lean side to side, and how much power goes into each motion, by tracking speed. It knows if you lob a slow fake punch, and it knows if you slice a fast uppercut through the air, and shows you with popping white circles around your fists or feet or head. Orientation tracking is cool as well, and will apply more to how your character moves around in games.

The heart rate monitor, which reads your heart rate just by freaking LOOKING AT YOU, seems pretty accurate, but we obviously weren't able to test against an actual heart monitor. Still, do you see this, guys, seriously this is a thing that will be in living rooms. It's very cool.

The face recognition recognizes you, personally, and can tell if you're "engaged" or not engaged, meaning if you say "Xbox pause" while not looking at the TV, it won't listen to you. This seems like something you'd maybe want to turn off, but it's still impressive it can read your expression and know if you're happy, sad, or bored.

Kinect 2 doesn't just see you, though; it can hear you too. In fact, it can hear your voice, specifically, through whatever ambient game and/or movie noise that's going on around you. Want to give a command in the middle of a particularly loud concert video or melee? You don't have to shout for Kinect 2 to listen and comply.

In a blog post, Major Nelson has some good news. "Should you choose to play your game at your friend's house, there is no fee to play that game while you are signed in to your profile," Nelson wrote. The blog post also mentioned that customers will be able to trade and sell their used games at retail outlets.

However, Microsoft executive Phil Harrison, in an interview with Kotaku, has some potentially bad news. The aforementioned 'fee' to play games on a second account? Full MSRP. So if you want to play your game on another system, you'll be dishing out an extra $40, $50, $60 - unless you're logged into your main account. (Parental controls will allow you to grant access to other accounts on the same hardware.) Harrison did tell Kotaku that his company plans to allow gamers to 'trade' their used games online somehow - though declined to get into further details.

1.Borderlands 2
2.Metro Last Light
3.XCOM: Enemy Unknown
4.Borderlands 2 Psycho Pack
5.Counter-Strike: Global Offensive
6.Total War: ROME II
7.Call of Duty: Black Ops II: Uprising
8.Reus
9.Call of Duty: Black Ops II
10.Don't Starve