The charter school may want to rewrite the plan, in any case; each school has its own way of providing services, and they won't necessarily want to be held to the previous school's plan.
However-- if you can get him identified for special ed now, that puts you on a faster track to an IEP in the fall. Have you talked to the new charter about the need for special ed services? If not, I would... if you request a meeting now, you have a chance of getting one before October or so. This stuff moves slowly.
Good luck, let us know how it goes.
DeeDee
