Update
Buy it today (13-October-2015) from Amazon India without invitation. I added one in my cart with out any issues. here is the link
Earlier we posted about OnePlus 2 open sale may happen based on the Carl Pei (Founder of OnePlus) apologies when the messed up the invitation system of the OnePlus 2. Here is what he said
Over the past few days, we’ve been discussing how we can make it up to our fans for the delay. One of the best ideas we have is to open sales up for an hour sometime later this month or early next, to make the entire process a bit more painless for would-be OnePlus 2 users. We will need to look into production and operations to determine when this is most feasible. We’ll keep you posted.
Read more OnePlus 2 Open Sale may happen later this month or early next
Now OnePlus officially announced the open sale of its latest flagship phone, OnePlus Two. The sale will be for just one hour on October 12, 2015 from 12.00 to 1.00 PM via Amazon India.
You will not need an invitation to buy the Flagship killer phone and each person can buy only one phone. There is no clue on the stock company have. So if you are planning to buy one login to Amazon India before the sale starts and add it to the cart when the sale starts. Like other flash sales the product may go out of stock in seconds.
I received two invitations for OnePlus 2 (one from OnePlus and other from Ashwin 
) earlier and given it to my friends, they says the battery was draining really fast and after the ROM update it is much better.
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You can get a OnePlus One phone with in 60 minutes after ordering it , read more OnePlus One smartphones delivered to you in 60 minutes or it's free