It would be the first time I would play a Ratchet game online, but I don't even know if I want to because when it comes to playing online games, you encounter with many jerks (not referring to the R&C fans, but with anyone with any game in general). So I'll just play the game offline with people over at my place, like the good old days. 
I also noticed from the Gameplay videos that there isn't an annoying split screen too man, I so can't wait to play this with my little brother, boyfriend and well, the 4th player can be an AI I guess XD
And well as for online, we can try to play against each other, just gotta give out our PSN names, I don't have one yet but I'm sure I will by next year 
(so we can avoid strangers if we have to, lol)
somehow it remind me of little big planet if you play to four players with no split screen (online or offline) and if one person wonders off and does not return to the team within seconds *poof* you're gone and then resend back to the team.
The one thing i hope won't happen is that they make Dr. Nefarious into another "Eggman"
I'm pretty sure he wont, insomniac are more careful with their characters than Sega are, as far as I know 
Anyway, here's an impressions article from the Gamespot site (where the gameplay video is)
http://gamescom.gamespot.com/story/6273906/ratchet-and-clank-all-4-one-impressions
Interesting read 
I hope there will be Lawrence. 
WAIT! I just noticed something that hasn't been mentioned yet…
We've agreed that Lawrence probably repaired Nefarious, but why is
Qwark off his asteroid?
WAIT! I just noticed something that hasn't been mentioned yet…
We've agreed that Lawrence probably repaired Nefarious, but why isQwark off his asteroid?
Well, it's been confirmed that the story in All 4 One takes place two years after A Crack in Time (or after the upcoming comic series which is coming soon). So therefore, Captain Qwark would of been off that asteroid by now.
yeah, this game is over 2 years since the end of CiT so there is plenty of time for events to pass by but I'm sure the galactic authorities found Qwark as they were searching for Nefarious, thus saving his life XD
And yeah, I do wonder if Lawrence will be in this one too…
Maybe we will find out, why Qwark is still alive and became President in Ratchet and Clank Comics. What are going to release each month.
About 2 and a half weeks until the first issue comes out too! So yeah, I think it'll explain how some events were solved after CiT.
Who is the writter of This game?
TJ Fixman. The same writer for the future series and the Comic series
T. J. Fixman is an awesome writter. 
I can´t wait for 1st scenes 
can't wait :P