Well for marketing purposes, DC Comics did not give enough preview pages of Batman #13. Boo, DC Comics you suck! However, Dark Knight News has been collecting Greg Capullo’s (artist of Batman) sketches of Batman #13 just for this reason.
Warning: some sketches found may or may not be for Issue #13. Due to Capullo’s ambiguous tweeting, he might have leaked different sketches for different issues.
There is an interesting van driving around Gotham City and it’s even more intriguing to see the Joker wearing a mechanic’s suit. There are some scenes of the Joker holding his finger in front of Batman. Damian (new Robin) is talking to Batman about something.