But I wouldn't do anything until direct VGF pricing is out, probably within weeks. That might even be on the table, also sleeps 5.
Unless I've missed it, there may not be specifics yet on whether there'll be a daybed or just what for a third bed in the Big Pine Key hotel rooms soon to be "resort studios." Those won't have the pull-down bed below the tv like the current VGF deluxe studios have, I don't believe. So, while the resort studios may sleep 5, how they do that could be problematic. Those daybeds aren't that comfy, if that's what they are.
The current deluxe studios have the advantage of two baths, but I think 5 people somewhat past toddler stage would be cramped in those with the pull-down bed in use.
Besides, direct VGF prices will be in outer space once the resort studios are in the mix, I'm betting. And, no telling how much that could affect VGF resale contracts.
Buy where you'll most want to stay is the best advice ever, IMO. Too much chance you can't get what you need at 7 months.
ETA: Just a sec here--
Are there 3 kids or only 2 of opposite genders?
If 2 opp-gender...you could bring an air mattress and bedding for it in the 4-person studios so the kids each have their own bed if that won't cause fights. I've seen people say that's what they do in the 4-person studios when kids don't want to share a bed with a parent. Some said they had a kid who preferred the air mattress to a bed anyway, or they tossed a coin for who got the queen bed.
So, you don't actually need a studio for 5 unless there are 5 people.