• Python itself and pip are now available in the ad_testing channel (builds on top of defaults): https://py-free-threading.github.io/installing_cpython/#conda
• conda-forge support (work not started yet)
• Issue with installing noarch packages in conda (& other installers): noarch: python packages are not importable when installed with the experimental free-threading Python 3.13 build conda/conda#14053

Currently (as of July 23rd, 2024) the recommended way to set up a conda dev environment for free-threaded CPython is to install python and pip from the ad-testing channel, and then install everything else from source or from nightly wheels.