Is why we expected them today.We'll be accepting entries for the next day and a half, until midday UK time on Thursday 19th May. After that point we'll draw 1000 winners at random from the entries received. We'll have sent email notifications to the winners no later than 8pm that day.
Also from wowhead by Perculia:
The giveaway closes at 7 today and we should be able to send them out tonight. However if the new Legion build happens at the same time, the staff will be focusing on that so picking winners may be delayed.