Errr? I'm sure they put good effort into as it's such a huge property and will sell a lot on next gen console, heck they might arguably be the most important version (will probably sell second to current gen, but will have a bigger Halo effect). Besides that, Dice (I assume) has a lot of manpower.
If we assume consoles are king (they are) then XBO/PS4 are the premier console versions and as such are something of a flagship.
Slapping together a port would be something to happen to a game that doesn't sell 10M+ copies..., not one of the biggest franchises in the world.