The news came through this morning for me. The new Horus Heresy rules book has been delayed. The reason given for this is Quality Assurance. In other words, it did not meet the standards deemed worthy of publication by Forge World.
These kinds of issues can and do happen from time to time. To be perfectly honest, I would much sooner have a rule book that was deemed to be of the correct standard than a rule book that was sub-par and not worthy of publication of worthy of living up to the previously high standards that the entire Horus Heresy series has been setting for all of theses years. Hence whilst I'm someone sad that there will be a delay on the pre-orders, I'm actually not all that bothered.
Santa can wait :)