JetBlue Updating Boarding Groups

I wasn't expecting to receive this update - they are moving from letters to numbers and still have 8 groups:

We always like to give our Mosaic members first dibs, and want to let you know that starting next week (April 29), we’re introducing a simplified boarding process. All boarding groups will be numbered (Groups 1–8)—with Mosaic 3 & 4 in Group 1, and Mosaic 1 & 2 in Group 2 (both Groups 1 & 2 board through a dedicated lane).

Following is the new boarding order:

• Group 1: Mosaic 3 & 4 members, Mint customers
• Group 2: Mosaic 1 & 2 members, EvenMore® customers
• Group 3: JetBlue Premier Card Cardmembers, JetBlue Business Cardmembers. Blue Extra fares, Early Boarding Perks You Pick® (excluding Blue Basic fares)
• Courtesy Boarding: Active military, Customers traveling with car seats or strollers
• Group 4: JetBlue Vacations customers and general boarding based on seat location
• Groups 5 - 8: General boarding based on seat location