Catch Cans come up on the other F150 forums almost as much as the "how often should I change my oil" or "what oil is best" threads - at least weekly.
The current ecoboost engine hasnt changed in design to change the talk of whether or not a catch can is needed, but I am of the opinion that if it makes you feel better than go for it, but its not needed, just like it is not needed to change your oil before 10k or your OLM tells you to. My experience to back this up is working with a fleet of over 100 F150s with the ecoboost (and many more than that when you factor out the ones we have replaced over the years) and we also have an oil lab at my work and sample whenever we service the trucks. Have never had an issue where I could say we should have had a catch can or changed the oil at 5k rather than 10k.
If you do install a catch can just make sure that you empty it regularly.