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 # Release notes
 
+- **2.0.0 WIP**
+  - `units` namespace renamed to `mp_units` (#317)
+  - header files in the `<mp-units/...>` rather then in `<units/...>` (#317)
+  - the downcasting facility is removed (#383, #211, #32)
+  - unified and simplified quantity creation (#274)
+  - Determining the best way to create a quantity (#413)
+  - V2 quantity_point (#414)
+  - introduction of `quantity_spec` to store not only `dimension` but also additional information about quantities (#405)
+  - `quantity` now takes `reference` object, which aggregates `quantity_spec` and a `unit` and a `representation` type
+  - units, prefixes, dimensions, quantity specifications, and references are passed as NTTPs to templates and provide arithmetic operations and comparison
+  - expression templates consistently used in all derived types to increase the readability (#351, #166)
+  - derived dimensions are now factors of only base dimensions (#281)
+  - Interconvertibility of derived quantities (#427)
+  - dimensions, quantity specifications, units, and references are now composable, significantly reducing the number of definitions and resulting types
+  - heavily simplified unit systems definitions (no need to define unnamed derived units, systems-specific dimensions, aliases for quantities, concepts, UDLs, ... anymore)
+  - improved definition of all systems
+  - support for all (or at least most) ISO 80000 quantities
+  - faster than lightspeed constants (#169)
+  - extensions to quantity formatting with `fmt`
+  - `quantity_kind` removed
+  - much easier and safe casting of unit with `operator[]` and `.number_in(Unit)`
+  - quantity can no longer be constructed with a raw value (#434)
+  - Implicit construction of quantities from a value (#410)
+  - `ceil` and `floor` are dangerous (#432)
+  - quecto, ronto, ronna, quetta new SI prefixes support
+  - many smaller changes not possible to address with the previous design (#205, #210, #134)
+
 - **0.8.0 June 14, 2023**
   - (!) refactor: `common_quantity`, `common_quantity_for`, `common_quantity_point`, `common_quantity_kind`, and `common_quantity_point_kind` removed
   - (!) refactor: `named_derived_unit` removed as it was not used