I´ve heard that there will be a European sub-committee for the Japanese initiated lens mount standardization. How can I join this group ?

Yes, in fact the EMVA has been informing interested stakeholders about the progress of the Lens Mount Standardization initiative of the Japanese association JIIA. We are planning to launch such a sub-committee soon. Please send your contact details to info@emva.org with the request to be informed about Lens Mount Standardization and we will keep you informed.