Despite the big protest on official forums, violent tantrums on fashion blogs and numerous bug reports in Rise of Isengard beta, Robe of Viisaus' changed appearance made it to live.
Nothing much to talk about - there was no official word from Turbine about this as far as I know, the robe's change wasn't even mentioned in the RoI release notes (even though many other cosmetic changes were). I still hold a tiny chunk hope that this is just a very low priority bug and we will get the robe back.
Until that happens - rest in piece my beloved robe :(
(screenshot by Hymne)
Comparison of the old and new version of Robe of Viisaus available here