CCP Falcon announced today via a news post that the Eve Launcher is going to be updated tomorrow. It will be a streamlined, and more efficient launcher, which should reduce load on PCs for launchers with a lot of accounts.
Other QoL changes include an improved progress bar when starting clients and a new loading indicator. The issue where the launcher forgot accounts should also be resolved, and there will now be an error message rather than your accounts just disappearing from the launcher.
So far, so good, however, the new launcher is incompatible with the data from the old launcher. This means that tomorrow when the launcher is upgraded, you will have to enter all your account information again for every account that you have. Also, from tomorrow, the launcher will forget unpinned accounts if you update it, or change from TQ to SiSi.