Fast Forward Entertainment appears to be the first major publisher to be on the receiving end of action from WotC regarding OGL violations. They have posted a full announcement on their website, reprinted below:
This contains official notification of conformation to the terms of the Open Gaming License version 1.0a (the OGL) and the d20 System® License version 4.0 (the d20 License) pursuant to Section 13 of the OGL and Sections 4 and 5 of the d20 License.
Fast Forward Entertainment, Inc. product number FAF2018 Enchanted Locations: Crypts & Tombs contains material from Wizards of the Coast product Monster Manual II without an independent license from Wizards of the Coast. The material used in this manner is protected under Product Identity in name and content. Fast Forward states publicly that this material is not Open Content and was used in error. No use of this material in Enchanted Locations: Crypts & Tombs is a challenge to copyright or trademark status. Furthermore, let it be known that any copies of Enchanted Locations: Crypts & Tombs in Fast Forward's possession have been destroyed.
Fast Forward Entertainment, Inc. product number FAF2010 Dungeon World contains references to the gods Gruumsh, Pelor, Merrshaulk and Hieroneous. These gods and characters are Product Identity and were used without permission or an independent license from Wizards of the Coast. Fast Forward states publicly that this material is not Open Content and was used in error. No use of this material in Dungeon World is a challenge to copyright or trademark status. Furthermore, let it be known that any copies of Dungeon World in Fast Forward's possession have been destroyed.
Fast Forward Entertainment, Inc. product number FAF2014 Dungeon World: Secrets of the Enemy Capital contains references to the gods Lolth and Gruumsh. These gods and characters are Product Identity and were used without permission or an independent license from Wizards of the Coast. Fast Forward states publicly that this material is not Open Content and was used in error. No use of this material in Dungeon World: Secrets of the Enemy Capital is a challenge to copyright or trademark status. Furthermore, let it be known that any copies of Dungeon World: Secrets of the Enemy Capital in Fast Forward's possession have been destroyed.
Fast Forward Entertainment, Inc. product number FAF2005 Rings of Power contains references to Drawmij and Gruumsh. These gods and characters are Product Identity and were used without permission or an independent license from Wizards of the Coast. Fast Forward states publicly that this material is not Open Content and was used in error. No use of this material in Rings of Power is a challenge to copyright or trademark status. Furthermore, let it be known that any copies of Rings of Power in Fast Forward's possession have been destroyed.
