Here is the link to my updated CastSpellWnd.xml file to include the 13th and 14th spell gems. Remember the 14th spell gem does not have an AA yet to purchase it, as of this posting. It should look exactly like Savok's 12-spell-gem file, except with two more gems. (It should also be exactly the same as Savok's coming update, so Savok could literally just use this file.)
The file is not zipped, so you can read it before downloading it or even just edit your own file for yourself without downloading my file at all if you want to be safer. You can just copy this file over your current beta file, if you want to be lazy like me. Let me know if you have an issue downloading this.