Area's of consideration would be in teaching the model what a human wants from a language. An AI might see that not everybody speaks one language and lean towards a symbol based language that transcends any individual human language bias.

Then how would you train that - show it what computer languages have come before, would it weight it upon how well they are used to get an idea of what humans prefer - the prospects of some java-C-Cobol mutant language do seem a logical output perhaps.

Area's in which I'd like to see AI focus would be - optimisation and code auditing. Which may well prove easier as you have a solid defined goal. Also such endeavours would prove invaluable down the line if you wanted to have AI come up with a programming language. As to do that you would need to train how humans communicate/think and how computers communicate/think and meet in the middle.

[EDIT - spelongs]