The speech was through the preschool itself or through the town or city? If it's through the town or city they should come out to whatever program you have him enrolled in since there's a need there. I would give the town special ed services a call and let them know you have enrolled him in a different school and would like his services performed there. They should be able to tell you what needs to be done. You can also talk to the school director where he is now. They might have some suggestions for you or could know who's in charge of speech and could get the person out there. A simple thing like changing the location shouldn't be too big of a deal. He still needs the services. Plus an IEP has to meet the needs of a child and if it's not meeting the needs then it needs to be changed. If they can't come to this school then they would have to provide some other place where he can get his speech.