Mp3 support, folder organisation, and a YouTube app would be nice.

You missed the most important one. An official Keyboard + mouse setup for those who want to play 1st person games properly.

DLNA support.

Support for airplay/chromecast protocols would be nice.

1 - For me, it just doesn't matter. I want to have as much trophies as I can and hiding my PS3 ones would cut my list in 80%. But as a filter to search, I think it would be a valid feature for people that want too see a breakdown per platform.

2 - I don't like it that much, I'm happy with the sharing and social features of the console. It is trying to be more Facebook-like and that's the premium experience everybody wants.

4 - Absolutely no, a huge and big no. I always like to see wich players I met so I can add someone later. On PS4 they break the list by games and that's awesome. I want the list to be as big as it can so I can add people that played with me even days ago.

5 - It would be nice, the list gets too long if you have a lot of games. A seach function would be good too after the library gets too big.

The only thing my PS4 needs is Bloodborne inside of it.

I like that thing that tells me how rare is the trophy, very clever feature.

Well, it would be cool to have digital PSone emulation, to those that are not longtime Sony fans.

I highly disagree with nr 4. It's not intrusive, and it's useful if you've played a game, and want to add some of the players you've played with. I found it particularly useful when I was playing with some people in LBP.

i hope not because that would be very lame :/

It needs more apps. I miss Twitch and GT from the 360.