Uhh
https://www.youtube.com/results?search_query=dead+or+alive+4+x05
Watch anything that is named x05. Its really hard to tell with people mashing, but you can spot some things are different. Its still very much doa4 with things like being able to hold off a wall bounce, but like if you watch this video
watch the Ayane vs Hitomi fight and you'll see the stun system is much similar to 3 than how it ended up like how Ayane got max height in 2 hits of a critical stun where as in the final build that would have barely picked Hitomi up off the ground.
I still think the game was going to be terrible competitive, but it would have stung a lot less probably if we had that build of the game. Its really hard to say though since I think the only person that really ever got their hands on the build was DrDogg since he is part of the media and a lot of his write ups about the builds seemed promising, then we got the game and everything he had talked about wasn't in the game. It was like the game was almost completely altered within 3 months.
Edit:
Also, IMO the game looked faster in the X05 build. It may not have, but it certainly seemed like it was. Movement seemed again similar to doa3 instead of the feeling like wading through water in the final build.