Well, beta versus live, I used to track it starting the summer of 2017. Beta and live used to match exactly for what was offered but the order was different. Then, somewhere in 2018, one beta special wasn't on the live version, something different was in the live version, but only 1. It has been like that since almost every event, seems 1 beta daily special is not in the live version. Now, what did still track, the newer items offered in beta. So, this event, beta had 3 WF selection kit, 2 Carousel, 1 checkmate square, 2 Globe Fountain, 1 Balloon Site. I will expect at least 2 WF's, 2 Carousels, 2 Globe Fountains (my expectations based on my tracking experience). Now, Balloon Site and Checkmate Square fall under a completely different category for me, the prizes offered in previous Historical Questlines. The historical questline buildings have been offered for AUCTION only in the antique dealer, never on the shelf to buy. This is new and I cant really predict what will happen. So, we saw the Gondola Market offered live but it wasn't in beta. Does it replace 1 of the 3 WF selection Kits, Checkmate Square, Balloon Site? Or, will it replace something else like 1 of the 2 SoKs. I think if you polled players, 99% would hope it is Balloon site that is replaced (leaving 1% bcs gotta be someone out there that likes it...lol). So, nobody can really know the answer to Checkmate Square, we are dealing with a new approach (not item) by the developers. I don't recall buildings from Historical Questlines being offered in events.
I read someone hoping for a Sentinel Outpost, I don't expect it. I do see it popped up in the 2020 Soccer event so I expect to see it there.