- Add ``/account``, ``/account/register``, and ``/account/logout`` to authenticate with the identity server. (`#2255 <https://github.com/matrix-org/matrix-doc/issues/2255>`_)
- Add endpoints for accepting and handling terms of service. (`#2258 <https://github.com/matrix-org/matrix-doc/issues/2258>`_)
- Add ``/hash_details`` and a new ``/lookup`` endpoint for performing hashed association lookups. (`#2287 <https://github.com/matrix-org/matrix-doc/issues/2287>`_)
Backwards Compatible Changes
----------------------------
- Deprecate the v1 API in favour of an authenticated v2 API. (`#2254 <https://github.com/matrix-org/matrix-doc/issues/2254>`_)
- Add ``/3pid/unbind`` for removing 3PIDs. (`#2046 <https://github.com/matrix-org/matrix-doc/issues/2046>`_)
Spec Clarifications
-------------------
- Fix various spelling mistakes throughout the specification. (`#1853 <https://github.com/matrix-org/matrix-doc/issues/1853>`_)
- Fix route for ``/3pid/bind``. (`#1967 <https://github.com/matrix-org/matrix-doc/issues/1967>`_)
- Add missing aesthetic parameters to ``/store-invite``. (`#2049 <https://github.com/matrix-org/matrix-doc/issues/2049>`_)
- Clarify what the client should receive upon sending an identical email validation request multiple times. (`#2057 <https://github.com/matrix-org/matrix-doc/issues/2057>`_)
- Clarify that the default transport is JSON over HTTP. (`#2086 <https://github.com/matrix-org/matrix-doc/issues/2086>`_)