Basically it's affecting the new applicants who would apply for the card and would not be able to double dip.
So if your planning to open the card and get the $300 Credit and 50k best would probably be before the 21st as that way you can get another in 2018 (jan).
What's the best way one would apply for this card and beat the 21st of may deadline? (online,phn,in branch?)