The Linux Mint team has released a stable version of the Upgrade Tool so LMDE 4 users can now upgrade to LMDE 5. Unfortunately, you still need the terminal to install the Upgrade Tool.
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The Linux Mint team is finally working on an upgrade tool that will give users a graphical way to upgrade to new major versions of Linux Mint. It will be available in a couple of months.
Linux Mint 20 has been codenamed Ulyana. All subsequent releases in the 20.x series will also likely start with the letter 'U'. The project also reiterated that it will drop 32-bit ISO support.
Linux Mint Debian Edition 4 has just been officially released. Here's a look at some of the new features that you'll find in the update and information on how to upgrade LMDE 3 installations.
The latest version of Linux Mint Debian Edition has begun propagating on official mirrors. The Linux Mint project has not announced the update yet but is expected to in the coming days.
The Linux Mint project has released a beta ISO of LMDE 4 to third-party mirrors. The official announcement is still to be made and the stable release of LMDE 4 could be around one month away.