No date has been set as yet, but it will be a date that gives all customers plenty of time to upgrade.
When v4 came out, we didn't EOL (and kept up sig updates) v3 for over a year.
With v5 out, V4 will be around that long at least. Since we haven't yet released a version of IDSMC that supports v5, this has delayed a lot of customers upgrading, so we will certainly take that into account when deciding to EOL v4.
