"Work on cognitive enhancement will probably be done first in monkeys, proving Planet of the Apes prophetic within the next decade or so :-)"Many (most?) of the alleles implicated in superior cognitive functioning will doubtless have other physiological effects. This 'multiple and diverse impact' of genes is called Pleiotropy.
For this reason - when we have a list of the relevant IQ alleles - we would be ill-advised to shift into genome-editing mode and just flip all those genes to their 'enhancement' variants.
Naturally, there'll be loads of research first on mice, monkeys (expensive) and .. cats.
Contra Wittgenstein, I may yet share my life with a truly biologica Aineko before I die.
(Nothing worse than being incessantly nagged by an entitled creature which believes itself master or mistress of the universe and which additionally possesses claws).