My twins started K last week but they are not super speed academics yet...but they also are only 4, just preparing to turn 5. They have already stated that everything the teacher is teaching they already know (they are reading and doing addition/subtraction etc and the class is doing letters and number identification...)...which frankly I'd love to never hear again...as my oldest has worn me out educationally with teachers and issues! Their teachers are aware of big brother DS8 and his abilities and acceleration so they said they would let me know how it is going at the first conference. My twins are FAR more advanced socially and behaviorally than DS8 was at this age...so I don't think they will get noticed as easily as he did.
I hope your little ones have a successful year in K! Its the first big step into the school system!
