Bluetooth LE Audio support (BAP Profile)
Bluetooth LE is a low powered variation of Bluetooth with less bandwidth. BT-LE (previously BT-Smart) arrived as part of BT 4.0.
LE Audio, AKA Auracast, was introduced in 2020 as part of Bluetooth 5.2, adds support for multiple sources (one headset multiple hosts) and multiple destinations (broadcast/multicast to multiple endpoints) generally Multi-Stream Audio and Broadcast Audio.
It's default codec is LC3 (Low Complexity Communication Codec) which has [gstreamer/gstreamer!4376 (merged) MR4376] in progress in gstreamer.
The core pieces are now upstream in bluez git to support BAP (the Audio profile), BIG (Broadcast Isochronous Group), BIS (Broadcast Isochronous Stream).
BAP seems to be the piece that pipewire would support similar to A2DP/HSP/HFP so it seems all the dependent pieces are falling into place to be able support this in pipewire.