"The new ones are in the bag," Scott said, " no question about it." (For more reaction from Scott, check out today's Team Titleist Tour Blog post.)

And here's a right-handed set of the new Prototype CB irons being worked on in the Titleist Tour Van.

Can you guess the owner of these new Prototype MB irons?

The custom Cowboy Orange-paintfill and "R" stamping should give it away…

It's Titleist Brand Ambassador Rickie Fowler, of course.

The Titleist Tour Van is a bit more crowded than usual this week, thanks to all the boxes of new Prototype Titleist AP1, AP2, MB and CB irons (712 series).

Looks like Titleist Brand Ambassador Graham DeLaet has a package (new Prototype MB and CB irons).

Out on the range, Titleist Brand Ambassador Jimmy Walker gives his new Prototype MB irons a first test run.

Titleist Brand Ambassador Kevin Na gives his new Prototype AP2 irons a closer look.

The new Prototype AP2 irons are already in the bag of Titleist Brand Ambassador Scott Stallings.