I received an email from a Shenzhen dealer who ordered M500 today.You mean hardware improvements? Why would SMSL sell half baked equipment in the first place...hope its not like the case for SU-8 and the SU-8(V2)...maybe @SMSL-Mandy or @SMSL_Liu could clarify...
The product seems to have been collected by SMSL. Perhaps the reason is firmware update.
Let's wait a little longer.