I would write to school to notify then about my childs strengths and weaknesses and request that he be placed with an understanding teacher. Then I would wait and see how K goes, you should get a lot information and feed back from a good teacher.
Our school will not skip grades until after K NEways and only then if they have mastered ALL areas off the curriculum, but I have heard of other schools which they place students in one grade for math and another for reading. Good Luck and try not to worry so much, there are alot of gifted children out there that loved K