Roamy here. I found this press release, looking up the answer to a reader’s comment. There will be a series of tests on a mockup of the Orion space capsule, but the capsule itself will not be pressurized. Looks like someone was watching Mythbusters and came up with a cheap solution for added buoyancy.
Of course, I’m old enough that when I think of lots of ping pong balls, I think of Captain Kangaroo.
P.S. Go Hokies!