OK, guys!
Apparently we will get a new character named “Luca” in the upcoming seasons!
This is a german website that lists the german voice actors for Voltron and it lists a new character named “Luca”, the voice actress is named “Luisa Casper.” I don’t know about america but in german Luca is mostly used as a male name (mostly, not necessarily though). The voice actress is female but that also doesn’t have to mean anything. So we don’t really know anything about this possible new character.
This site can be totally unreliable but I gotta tell you that prior to season 5 I already knew that we will see Keith’s mother at some point as she was already listed as “Keith’s Mutter” on this site before. NO GUARANTEE THAT I’M RIGHT ABOUT THIS, JUST AN INTERESTING OBSERVATION! Edit: WHY DOES THIS PICTURE SUCK SO MUCH, HERE IS ANOTHER ONE