My guess is all effort will be put on California, not necessarily to win it, but to put the results into question, or delay the counting somehow. No point in doing anything else. It's a two-way-win: make it look like California will be hell to force Hillary to claim victory after NJ, which would give him a justification to contest the whole process' validity, yet if she plays along and waits for California then go ahead and make California's process hell to drag it on as much as possible hoping the DNC will misstep trying to seal things up, which brings him back to having a justification to contest the whole process.
Either way, the end goal is "I can go as far as I need to, their only option is to kick me out and if they do I have a reason to run against them". It's the same tactic Trump had with the GOP.