According to Louis Dangoor of WrestleTalk, Sasha Banks vs. Bayley was originally planned for SummerSlam 2020. However, WWE now wants to extend the feud as they reportedly see more potential in drawing it out rather than rushing it.
The report goes on to say that part of the decision to delay the match has to do with the venue. SummerSlam was originally slated to take place in Boston, where Banks is billed from, but those plans are now up in the air due to the coronavirus pandemic.
WrestleTalk ends the report by noting that Banks vs. Bayley at SummerSlam isn't off the table, but WWE is "considering other options" at the moment.
WWE has made no announcement regarding plans for SummerSlam. Boston Mayor Marty Walsh said earlier this month that events attracting large crowds should start looking at alternatives now as the city will not issue a permit for such events before Labor Day (September 7).
SummerSlam is currently scheduled for August 23. Boston was set to host a week of WWE programming including SmackDown, NXT TakeOver, SummerSlam, and Raw.