@andersy005 I think it would be good to keep a running list of NamedArray tasks. I'll start with a rough sketch, please update/edit as you like.

• Refactor out NamedArray base class (initial refactor for NamedArray #8075)
• publicize design doc: Scientific Python | Pangeo | NumPy Mailist
• Migrate VariableArithmetic to NamedArrayArithmetic (Migrate VariableArithmetic to NamedArrayArithmetic #8244)
• Migrate ExplicitlyIndexed array classes to array protocols
• MIgrate from *Indexer objects to .oindex and .vindex on ExplicitlyIndexed array classes
• Enable explicit use of key tuples (instead of *Indexer objects) in indexing adapters and explicitly indexed arrays #8870
• Migrate unary ops
• Migrate binary ops
• Migrate nanops.py
• Avoid "injecting" reduce methods potentially by using generate_reductions.py? (Move Variable aggregations to NamedArray #8304)
• reprs and formatting.py
• parallelcompat.py
• pycompat.py (Migrate VariableArithmetic to NamedArrayArithmetic #8244)
• Give NamedArray Generic dimension type #8276
• have test_variable.py test both NamedArray and Variable
• Arrays with unknown shape NamedArray.shape does not support unknown dimensions #8291
• keep_attrs for NamedArray #8306
• pydata/xarray as monorepo for Xarray and NamedArray #8310
• Should NamedArray be interchangeable with other array types? or Should we support the axis kwarg? #8333
• Try to preserve imports from xarray.core/* by importing namedarray functionality into xarray.core/*

xref #3981