Heads up! Radxa are taking preorders for the new Rock 5 SBC.
This is based on the RockChip RK3588 SOC, which by the look of things is about 2 to 3 times faster than the Broadcom 2711 in the Raspberry Pi 4. It would give Zynthian a serious kick in processing power, for running hungry synths like Pianoteq, Surge, etc.
https://browser.geekbench.com/v5/cpu/compare/11836244?baseline=12073179
The Rock 5 board includes 8 ARM cores: four Cortex-A76 cores @ 2.4 GHz and four Cortex-A55 cores @ 1.8 GHz. Amongst other interesting features is 4k HDMI video input, as well as the ability to drive 3 displays. There is a 40 pin GPIO connector, and it runs Debian Buster and Android 12. It also directly supports NVMe SSDs.
Shipping is Q2 2022.