The complete changelog from Teddy:

Hey guys! We've now released an early access build of 2.1 for all of you here in the tools group, including symmetry painting, a material ID creation plugin for Max & Maya, wireframe & backface culling toggling in 3DO + lots of other improvements & fixes. Have a great weekend everyone émoticône grin
- Introducing: Symmetry Painting, including 1 plane, 2 plane and 3 plane symmetry options
- Introducing: Quixel Colors 1.0, for quickly assigning material IDs in Maya and 3dsmax
- Added Wireframe toggle, including presentation settings
- Added Backface Culling toggle
- Added 3D Paint Invert toggle
- Added Seam Dilation slider in paint mode
- Improved Metal & Wood base material values
- Importer in 3DO now loading faster
- Improved UI for input fields in 3DO
- Fixed issue with disappearing Dynamask editor
- Fixed offline activation bug
- Fixed license activation bug
- Additional minor bug fixes