The general practice here, from my experience, is adding an underscore at the end of the package name. (i.e., native_). I think that's reasonable. We don't want to get too concerned about it as it will autocomplete just fine.
Also, shouldn't we be switching to the root package org.arquillian?
Yeah, we could go for that native_ string, it is better than my _native but still not my cup of tea anyway ... nevermind. native_ is good.
Regarding of the name of root packages, I could go for it easilly but wouldn't be there a clash with groupId of Maven? Extensions have groupId org.jboss.arquillian.extension and containers have it like org.jboss.arquillian.container, as any other Arquillian container and extension does. I think the name of any root package should be the same as much as possible as groupId ...
Stefen, this is a new module so we can start of here with org.arquillian. Arquillian Core will follow in 2.0.