I think he is traveling to where Big Mom is and when he arrives he will have to make his move and betray big mom
Yeah that's quite my opinion too.
But since Jimbei is an honest man, I think he won't "betray" but more "explain" to Big Mom that he wants to leave. And that's how she will hurt him and start a war against the SH.
And where is big mom? currently chasing a few of the straw hats en route to Zou, either way...he is coming!
So much is happening at dressrosa, where it needs to end and immediately spawn into something else.