I really with agree with 4 and 5! 1 and 2? Ehhhh, not so much! :/

.. You really see the craziest sh!t on live with Playstation lol

Guess what guys!? I'm on Live with Playstation right now and I want you all to take a wild guess what people are streaming? Besides the fact that people are streaming Driveclub(which i dont know how), we have people streaming Mario Kart 8!

I'm watching it right now as I type this LOL! THAT'S RIGHT! On Live with Playstation, people are streaming Mario Kart 8 via The Playroom!

Now what does this tell us?

1. no region lock.
2. op's 1st feature - Wii U has the stamp collection - some posters already here have mentioned to use it online like a scrapbook to show other friends/people online what are his games and his completion. not technically the trophy but the stamp collection is one near to it.
3. op's 2nd feature - stream games which is good and it would help other Wii U owners how good are those games are especially the 3rd party games. it would help the games sell more
4. notifications - like what the op have said, it needs be to there is one of your friends is online, etc...