The bug is now fixed, however the exchange usually extends beyond the fix date of a bug to allow those affected time to take action and get the rune. The actual bug was that the tank quest at level 35 gave most of us the brutality rune. For a short period, that quest did not include the brutality rune, which was a bug. The exchange ends on the 3rd November, which is plenty of time for those affected to get that starter rune.
With regard to the remaining runes, the only other runes obtainable as a drop from tanks is Blood and Heal runes (same as before). The reason the drop rate was decreased so much is because, for those who have those runes, the rune packs with the rune stones provides a lot more rune exp than what a type-specific rune does. I appreciate that is not much condolence for those waiting on their second rune, but once you get it, you will be grateful of not being landed with another of the same type any time soon.