This still dances around my questions. And the wording of that PR doesn't make it sound like it does what I would consider the bare minimum.
Are you supposed to sit and wait in your apartment?
For what?
Do you mean for your friends, to go on and play something?
The first time you get together in a given 'session' of gaming, your friends will all have to come together into one spot. But thereafter, from how I read it, you can go into games together, and when you leave games you'll be back together again in Home (you won't have to wait to find each other again).
Physical proximity in Home may not even be necessary, so you may not need to wait for everyone to come together in one place. I'm guessing you go into your PSP, can select some friends, and initiate a game launch - your friends may get invites to join that game launch on their psp, wherever they are in Home. But that's just my speculation..
Re. in-game messaging and Home, if in-game phone calls are to be there as rumoured, I would say in-game 'sms' (i.e. text) would be too..but take with a grain of salt for now, I don't think that's been confirmed yet.