Finally Velcro is a choice for the zipper protecting stormflap also in the Extreme Drainage Coverall!
The snap buttons, that were previously the only choice, had a nasty habit of coming loose at some point while wearing the suit. Also getting them closed was always a little chore especially if you had gloves on.
Here are a few photos from the factory from a suit that has the Velcro on:
It seems that this drainage suit was also fitted with a modified hood that can be opened and closed with a Velcro as well. I guess that is an option too if somebody wants :)
I will have the above green suit in my hands in a few weeks. I'll take better photos of it when I get it.