Don't expect breaking changes - the STM8 eForth core is quite mature now.
The default build environment got an update to SDCC 3.8.6 (but it was tested with SDCC 3.9.0, too), and the binary export from uCsim got an upgrade (it's a nice Python script now instead of a lean-and-mean AWK scriptlet).
More internal constants can be exported with #require, STM8L chip got better support thanks to @Eelco. Coding with inline machine instructions is easier thanks to a number of bit copy and assembly interface words.
And of course, there is more docs.
More info is in the release notes: https://github.com/TG9541/stm8ef/releases/tag/2.2.23