According to WSDOH, they claim a lot of unknowns. This second strain came from South Africa, the first 'strain' from the UK. That was the one that allegedly spread faster and more easily, but otherwise was not vastly different than original.
The WSDOH cites the Institutes for Disease Modeling, or IDM, the Bill Gates creation and Inslee uses as his "Bible" for COVID decisions. Multiple sources indicate the only states where IDM data is being heavily used are WA and OR.
For those who wondered, the BFHD cannot legally force a business to deny service to a non-mask wearing consumer. Some say this is a pre-emptive move, designed to avoid a 'legal' edict from the state, like the one in Yakima County.