As far as I could see neither the trainer nor the editor works with the new update, but I'm not the end all authority on it.
Just my bad timing, I'm in Denmark so while cities of tomorrow is released for the americans and asians, I get to stare at a download clock. So wanted to go back to xcom for a bit... and it downloads an update that breaks compatibility with the trainer.
Seriously... The only place I have even worse timing... is in relationships.
So far neither the trainer nor, the editor seems to work for me with Enemy Within. When you press F1 to activate the trainer, it is unable to detect the Enemy Within client, and the editor doesn't recognize that the game is running at all if you choose enemy within at the startup.