I haven't seen Jersey Girl, but since I was a big fan of the Askew-niverse, I don't feel like I missed out on that much, especially with the not-so-hot reviews.
That said, I don't see why people keep pointing specifically to Jay and Silent Bob Strike Back as what his next "Clerks" movie will be like. Kevin Smith is the last person who'd fall into a rut of doing the same thing over and over again - if one watches the Askew-niverse movies in order, that should be blatantly obvious; they may all be in the Askew-niverse, but the tone of each one is different (which is all the more amazing since he's coming at them from the same artistic stand-point, discussed below).
One of the things that Kevin Smith has always done very well is portray post-modernism in his movies. Since he had planned that Jay and Silent Bob Strike Back was going to be the last film, he decided to make it a post-modern take on his previous films...in essence, the film wasn't meant to be anything but a spoof of movies; namely, his own previous movies. It's him poking fun at himself after poking fun at work, hobbies, relationships, and religion in, respectively Clerks, Mallrats, Chasing Amy, and Dogma.
Given the high-level of acumen he displays in showing the humorous oddities of various facets of life by mildly over-exaggerating their faults, I'm looking forward to Passion of the Clerks.