It's been stated that he wasn't even conceived until a bit after Dick became Nightwing. I don't think Dick has been Nightwing for 10-11 years. 7 seems a reasonable number.
And I don't care if he's the son of Albert Edison and Jesus Christ, no kid that young should be going around using his hax ninja skills to kill members of the League of Assassins when not teaching them poisons, outsmarting the Batcave's defenses, or building flying cars.
He's ridiculously young, insanely overpowered, and his only real "flaw" is that he's a jackass (which is an ANNOYING flaw), which Morrison's indicated he'll grow out of.
I hate to say this, but honestly now, there's no sense tapdancing around it... "Batman's long lost never-before-mentioned (even in situations when it would have made sense to mention him) genetically engineered son, that's younger than the previous Robins and more talented too"? Yeah, that does sound like something from a lot of bad fanfics.