Thank you both for your responses.
Grinity - This school requires the full IQ test for entrance into Kindergarten. I believe they use the WPPSI if they administer the test themselves, but accept a wider range of IQ tests if administered elsewhere.
My son has an August birthday, so he will be a young kindergartener. He is currently 3 1/2, and will be 4 1/2 when he needs to take the IQ test for entry into the Kindergarten program.
Their minimum IQ is 125, although entrance is fairly competitive and most students score significantly higher.
That is interesting that the high vocab/verbal subtest has the highest correlation to the overall test score. If he hit ceiling for score with language on this screening, that makes me feel more confident that he will do fine on the IQ test in the future.
Yes, our older child is a girl and has a very different personality and overall temperament than our son. It does seem like a lifetime ago that she was a toddler, and we certainly have our eyes more open now to gifted education issues.