When will Slayer be officially released?

Current in-game combat level is 23.  So I don't know if Vannaka works.  But all I know is that the level 1 Slayer Master at Burthorpe does not work, even the trade option.

I am a huge fan of slayer, if the name didn't give that away already.  +30M Slayer on RS one account, 60m+ in total.