See the release for the meet below.
I think this is a great idea and I'm hoping that since 2018 is an off year, some genuine stars will sign up for this meet.
Still a lot to be announced, but there will be 9 events, it will be team-scored and the meet will last two hours. I am fairly confident it will draw a good crowd in London, though it will be interesting to see if they can sell out. Remember, there's no Mo Farah and with Laura Muir stepping back a bit from running next year while she studies to become a vet, she may not be there either.
http://www.usatf.org/News/BRITISH-ATHLETICS,-USATF-ANNOUNCE-HEAD-TO-HEAD-MEE.aspx