Your DS clearly has extreme focus and high ability in specific domains. You have done an excellent job in providing a stimulating environment. Short of medical catastrophes or extreme deprivation, he will not end up anywhere near average. However, at age 4, it is difficult to see where he will end up in ten years or even in five years. Children has such diverse rate and timing of development as well as so many potential areas of development at any given time. Focus and passions also change. If his IQ concerns you, then perhaps consider testing in a year (minimum age for DYS) even though it will be another five years (about age 9) before IQ is likely to be stabilized. In short and in answer to your specific question posed at the end, I would not be overly "concerned with meeting his educational needs" or "just pleased that he is a bright kid" either. Perhaps somewhere in between: start familiarizing yourself with educational options/supplements but consider his "brightness" as just another characteristic rather than an issue of joy/pride.
