You will love it! We've stayed at OKW several times and that was our first resort on our trip this time that we cancelled.
They are the largest DVC villas, you'll be rattling around in there with only 4 people. The only downside to OKW to me is the transportation. Where you're located will make a big difference. So if you can make room requests, do it! We always try for building 23-26. It's directly across from the hospitality house and has a bus stop right next to it. It's a short walk to the main pool also. We avoid near the hospitality house because it's the last pick up for the busses. During busy times, they're often full by the time they get there and if they're doing reduced capacity on the busses, it could be a real problem. Or, just use your own car. We used Minnie Vans leaving the resort, bus coming back, but they can be pricey. And ask for ground floor, there are no elevators except for 1 building as I recall, and it's close to the hospitality house. Take a look at touring plans room finder, it's really helpful!
Otherwise, you got a fantastic upgrade, enjoy!