This layout generally produces what type of ball motion?

The 4X4X2 layout is usually found on Storm/Rotogrip drill sheets and listed as:

• High flaring, strong layout
• Good on multiple patterns
• Strong entry angle

The 4X4X2 layout converts to about a 42° X 4"  34° dual angle layout.

Storm Technical Director Steve Kloempken explains ball layouts using that layout as a example in this video.

Thanks for the info!

Is the 4x4x2 layout for asymmetrical balls only?

No, on a Symmetrical ball you just draw a line from the Pin through the CG, then measure 6 3/4" from the Pin and mark that point on the line and use that as the PSA (MB).

It's shown in the Storm Symmetrical Drilling sheet.

Storm Symmetrical Drilling sheet.
https://www.stormbowling.com/drill-specs/Storm_symmetrical_DI_lr.pdf

It's one of my favorite layouts and offers versatility across symmetrical and asymmetrical core balls. 

 Does this layout work better for certain type of styles ? Speed Dom, Rev Dom, High Track, Low Track

Or playing a certain area of the lanes on THS?

It's my favorite it always gives a big motion...

It's starting to be my favorite layout just in the last two years. Makes things easier and I use surface to tweak things. I just had a hyroad drilled this way yesterday making half my (small) inventory of balls 4x4x2 with or without p-hole.