Jamie Martin, Assistive Technology Consultant for Students and Adults with Dyslexia
I'm happy to hear that your son is, indeed, planning to attend college. As your family already knows, there is no reason why dyslexia should hold him back from furthering his education and reaching his career goals.
If your son is not using assistive technology (AT) already, I would encourage him to explore his options while he is still in high school. He may need AT support to get through the large amounts of reading and writing that most college programs require. Then, before he heads off to campus next year, he should contact his college's Office of Disability Services to make sure he will be able to use the AT that works for him. He will not have an IEP to make sure his accommodations are in place -- he'll need to be proactive and be a self-advocate.
I also recommend that your family take a look at Elizabeth Hamblet's book, 7 Steps for Success: High School to College Transition Strategies for Students with Disabilities. It is a comprehensive guide that offers great advice for all aspects of the college transition.