The promo card at the TDIL Sneak Preview is a Level 4 DARK Spellcaster-Type Effect Monster called Magical Something. The rest of the text of the card is currently too small to read.

Source: MystikX from Neo Ark Cradle

Also, Konami has revealed the theme they were implying as being called “Shambhala” has been revealed that its true name is “Subterror(s)”.