Whoever PO'd the Batmobile edition, well, bad news for you guys:
http://kotaku.com/batmans-big-collectors-e...nute-1712096244

Got mine, boot up, waiting for update to download before starting anything. But including all the DLCs it's more like 6GB of data to download

LOL I just jump back into Bloodborne chalice dungeons to make the wait less boring

Replay story mode with all your upgrades, counter indicator off and tougher enemies. Also, a slightly different intro

No new scenes except for full ending once you 100%, and some extra dialogues(when taking villains back to GCPD) if you complete Gotham's Most Dangerous missions AFTER the main story ends.

True. First time prompt was when you get 100%(actually earlier; a couple of bosses are optional but not having 100% only gives you half an ending), Alfred calls and you hit Square to confirm, then have to go up to Batsignal on GCPD roof to activate.

It starts the ending, yeah, everything is locked from that point and you can only go beat thugs on street or go to the bat-signal, IIRC.
But after the semi-ending it'll send you back to main menu, and you can resume the save file from the point before you hit the Knightfall Protocol command, so you can finish the rest.
It's a really pointless way to artificially lengthened the game, because you might as well finish up all riddles before doing that. At least that way you don't ruin the experience of watching the full ending in one go.

Yep. Happy hunting (Though these are nowhere as tough as the ones in City, IMO), interrogate every informants you see, some hostile ones can be re-interrogated after a batarang to the face (or 2!), which saves time looking for another one when nearing 100%

Well, screenshot you need quick reflexes to get the shot you want, photomode lets you stop time, move the camera and add filters to make better shots.

Yes you can, though I'd recommend you to at least complete them before triggering the ending sequence (you'll know when you get to it). It's a much better experience to watch the full ending in one go rather than half an ending-> finish quests-> rewatch full ending

You race in car? It's faster to just use the batmobile super eject boost and glide to destination....

Bug tank if you cannot reach, use the batclaw. And yes, those robot bugs are the ones indicated by the "break" symbol on your map Breakable walls are not counted, lol.