He looks silver dapple to me... silver dapple babies tend to be lighter around their eyes with light eyelashes - so without seeing him up close it is hard to say if he is greying out or not...
Sire was palomino that went grey?? Do you have a pic?
Many silver dapples are mistakenly called palominos. My guess is that the sire is a silver dapple gone gray/white. This colt is definitely a silver dapple. Time will tell if he will also go gray like his sire.