On Vampyric - it's a substitution cypher for the Latin alphabet. It was shown in one of the TLoV streams. Sadly, I can't find the stream (checked Twitch and YouTube). The closest I can find to a source is the gallery of the Wiki's TLoV page, which is difficult to read, due to poor image quality.
The first letter of each Vampyric House's name is their symbol. So the circle with a drop is a "d". Banners with each House's name have been released, meaning we could work those out.
Sadly, without finding a screenshot of the Jagex-provided translation, B, C, Q, W, and X can't be found. They don't appear in any Vampyric script besides the key, to my knowledge.
Interesting that Vampyric is similar to Infernal, seeing as both were under Zaros's rule.
03-May-2016 12:40:50