No lie, that just lost about three sales from my friends, who are not incredibly good and were looking to tag along with me to sort of even us out and have fun. I'm incredibly disappointed, as well. This was a major selling point for me and my group of pals.
We were explicitly told we COULD play online with four players on multiple occasions, which is why this angers me. It's ******** to say we can for months on end and then revoke those statements a week before launch. Shame on those guys for doing that to us.
Besides in a handful of tweets and interviews? Yeah, they did and realized it was too problematic to devote time to, so it was cut. I'm fine if it were mere speculation, but get your people in order so they're not lying to everyone about it. Make sure you're all on the same page.
EDIT: This was also the selling point of the mode itself for me. I won't touch it, as there is no interest or point to it. I've never understood the obsession with tag team modes if you're controlling both of the characters, as there truly is nothing special to it then, for me. I would rather be great one-on-one than adequate with micromanagement.