M.R.
Yes, I recognize everything you mentioned. I am glad you are going to a Neurodevlopmental Pediatrician, and you are on the right track. You will know what you need to know and have a comprehensive plan to help him.
I have two kids who fit that description, and they are both doing pretty well. Get more therapy when ever possible, suppliment what he gets at school with private therapy, as much as you can afford, read everything you can about his diagnosis once you get it and do all the homework the therapists give you.
There may be rough spots, but it will all work out in the end, though you may know more about all this than you ever wanted to know! You are doing really great to be getting to this at age 26 mo! That is the biggest thing on his side. He should do quite well.
If the therapy he is getting is state provided, start him with private therapy too, and vice verca if your therapy is private. EI will cover him until age 3, but be right on the spot at your local school district for an evaluation when he turns 3. Use both and given a choice between more and less, take more.
When you start with the schools, start learning about advocacy, start at www.wrightslaw.com. He will need you to be his advocate.
I know how it is, you want to know right now. One thing I would suggest is that you read an article on the wrightslaw site called "Tests and measurments for parents and advocates" If you read it several times over the summer, you will be ready to understand the evaluation data that the DP will share with you, and it will make more sense. By then, it iwill be nearly time to have him evaluated by the public schools, and this understanding will be invaluable. It is something you can do while you wait that will help you in the very near future!
I hope his evaluation brings you the answers you need.
M.