This upcoming release includes many major and minor refactoring and improvement, which requires some time to test. It'll be available for prototype tier first, and available for beta users later this month.
Group Mirror
Each group has its own local coordinate for mirroring and pivoting.
Transformation tools and menus are refactored to support this feature.
Groups have all possible properties (Blend, Mirror, Round, Shell, Color) now.
This feature will also support merging/importing objects with mirrored primitives in the future. (currently, one object can only have one global mirror plane, so it's impossible to merge two objects with different mirror planes.)
Smooth Mirror
Mirrored primitives and groups can be smoothly blended across the mirror planes to hide seams.
New Helix Implementation
Previous Helix SDF (both Z/S-types) has artifacts when the helix is too tall or too flat.
The new implementation resolves all the artifacts robustly and improves the performance as well.
I would say it's finally done this time.
Rendering Artifacts in Orthogonal View
Fixed the artifact when rendering flat surfaces in orthogonal view in some setups.
This is due to the low floating precision of ray depth when the ray origin is far away from the surface.
Minor Improvement
CPU and GPU usage is down to 0% when the program is idle.
The size of Drag 'n dropped primitives is proportional to the viewport.
Reference images can be selected and transformed from the Shape editor.