There has been one so far, where "an Africa XI" played "an Asia XI".
The format that appears to be proposed for the next one is SA, Zim, Ken, Ind, Pak, SL, Ban (or something of the type).
Which IMO is at least better than the former, because the players patently struggled to rouse themselves for playing for continents rather than countries. That did disappoint me, mind, because I do think intercontinental cricket would be interesting if it were taken seriously.