Congratulations! It sounds like an exciting new path. Well, he completed 6th grade math last year so he is technically skipping 7th grade math, which may or may not be much of a leap. You'll have to check your district's curriculum. In general, I wouldn't worry too much as long as your DS is on board although clearly you would want to keep an eye on his progress.
In our district, 8th grade accelerated/gifted math is Geometry. If he is in fact skipping Algebra I, I would just recommend testing him yourself to make sure that he has mastered Algebra I since while he won't need it for Geometry this year, he will need it for Algebra II next year.
