If my guess is right, I recently compared the new and current Pro-V1x balls.  I like the new ball a lot, but at my level of expertise, the difference is very slight.

Overall, I think I prefer the current pro v1x to the test ball. I did like the flatter trajectory that I seemed to have with the test ball. However, the feedback I get with the current pro v1 x and pro v1 is superior to the test ball.

Just got mine today, want to go try them so bad but its dark out. Good thing no work tomorrow!

You were kind enough to send me some prototypes and of course I don't know which ones I played (all marked TEST). Great soft Titleist feel, perhaps more distance but I thought I detected greater spin around greens. can't wait to get more!