We've actually been talking about this a lot internally. I'm not sure whether a decision has been made yet as to whether we stick with blue or go with green, but @Wallywood should be able to shed some more light on it.
The new forum is a big step up for us. If you want to tag people in your posts like I did in my previous sentence you can using the @ symbol. Super neat!
We're still working on overhauling this system currently. We would like for it to be consistent so that players understand exactly what they are getting when they gain veterancy.