Amazon had sent an email recently for selected customers and gave them a Golden Ticket, this ticket allowed the customer to buy the Yureka without any difficulties. Selected customer had a Yureka reserved for themselves. Yureka was up for (non-flash) sales yesterday for such customers with a Golden Ticket.
Yureka is powered by qualcomm snapdragon 615 64 bit octa core processor clocked at 1.5GHz coupled with Adreno 405 GPU. It is running Cyanogen 11 with 2GB RAM and 16GB storage. This is a dual SIM handset with 4G support. Check the full review here.
Today it will be the normal flash sale. Login few minutes / hours before the sale begins. Am sure you are well aware of the procedure, there is a waitlist too so best of luck.