This is hands down probably the BEST venue they could choose for Overland Expo East.
For those that don't know this is the same property that hosted Camp Jeep for more than a decade (back when Jeep still did Jeep things instead of rebranding Fiat cars with a seven slot grill, but I digress). It also hosts many large events (some much larger than Expo). I really hope they have a multi-year deal inked down because this site has the infrastructure sand site capactiy not only for for OE-E is today, but what OE-E can become in a few years.
As for the rain/mud, I doubt Expo East will ever be a dry or clean event given east coast weather in the fall, but this venue is pretty well estabtlished for large crowds and heavy traffic. I doubt we'll see the issues that plagued the small cute wedding ranches.
I also hope they make use of the property and let people spread out for camping. One of the biggest complaints historically plaguing Expo is how campers end up crammed in like sardines. This venue should have enough room for people to spread out and camp a little more 'organically' rather than shoe-horned into cemetery sized plots.
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On a side note, for those making the trip, the following weekend is the Virginia Rooftop Tent Rally at James River State Park which is a stone's throw away. It's a great small family-friendly event not unlike our Rendezvous. There are some classes, different activies, and a small vendor area. Not a bad idea to stick around the week after Expo for the rally. Oh, and an RTT is not required to attend.