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I believe Richard's episode is on the 23rd.
Re: the 1977 child versions of everyone being the ones in the Flash-sideways. I've definitely heard that theory, and it's one of the better ones floating around, to my mind. The idea being that the show could never give the characters a proper send-off after all this, so the only way to do so is to show us a series of flash-forwards all season long that are the ending, without us realizing it.
Re: fate/free will. Still not sure about this. I do think Jacob is on the side of fate, but both seem to do or say things from time to time that make it seem like it's the other way around. A tad confusing.
One last thing: while I do think "Whatever Happened, Happened" is probably accurate, we don't know for sure. It's still just something Daniel Faraday said, and he's already modified it a bit by saying he'd "forgotten the variables." All we know is that the show's creators insist we won't have a Grandfather Paradox to contend with.