How will firmware updates be handled?

I’m simply curious on how they will receive updates. Will it be through a shell script (like the Librem laptops), or is the LVFS program is going to be used (though I don’t really see any of the Librem 5’s chip manufacturer on there).

EDIT: As mentioned here there was mention of negotiations with the FSF for upgrading them with USB but also about the modem upgrading over the air. Has the status of firmware updates changed?