The recent World of Warcraft: Mists of Pandaria PTR 5.4 build added the Hearthstone board game. NPCs can be found outside the Vale of Eternal Blossoms cities playing the board game.
Hearthstone: Heroes of Warcraft beta testing will start sometime during Summer 2013. Just a matter of time. Learn more about Hearthstone through the Blizzplanet’s PAX East 2013 coverage and the official Hearthstone website.
I’m not sure if the NPC names are related to Blizzard Entertainment developers or if the intention was other. I do know there are a few developers that match those NPC names:
- Kat might stand for Kat Hunter (Former Blizzard Licensing Project Manager, currently Senior E-Commerce Manager)
- Evangelia — Evangelia Dendramis (Front End Web Developer)
- Mr. Creasy — Ryan Creasy (Senior Reliability Engineer II)
- Andy — simply too many Andrew(s) at Blizzard to figure out which.