your son does sound very bright, however i think there is a danger of "competitive parenting" rearing its ugly head here. My DD1 is extremely bright, i pushed her and pushed her through school as i thought she should utilise it, well how much did that backfire - has now dropped out of college aged 17 with few job prospects I was always comparing with other children and she picked up on this and rebelled big time.
My dd2 (aged 2) has speech delay, she seems advanced in other areas, has great understanding, can actually draw recognisable faces and animals (scary!) but you know what - Im the proudest mother in the world, i dont CARE if she cannot talk yet, she is a happy and sociable little girl. I am not going to make the mistake of comparing her with other children, i started down that road already with the speech and its heartbreaking. But, my little girl is 2, so is your little boy - you ask how to handle his brightness and my advice is DONT!! Just treat him as a child as an individual and respond to what he wants to do - the park, the woods, the beach, all the things a 2 year old loves, please don't be one of these mothers who insists on sitting with flash cards and an abacus trying to teach him to read fluently and be able to add up when he starts school.
Incedentally, i was extremely bright as a child, i could read books with no pictures when i started school, i had a reading age of 14, aged 6! But it tied me up in knots, i overcomplicated everything, put too much pressure on myself and i STILL do. I too left school not even having sat my O levels. I did return later having done a degree and PhD, but i did not find being bright as a child worked in my advantage as my parents pushed me too hard and i hated it (i made the mistake of doing this to DD1 because i didnt want her to make the same "mistakes" i did) I will not be repeating my mistakes.
The best thing you can do for your son is treat him like a normal little child, if he is bright he will want to do lots of things and enjoy them, let him lead you.