Stark does a slow roll-out of firmware updates based on bike usage, so far I've only seen 1.4.0 on an MX. I'm guessing us higher use EX riders will see it in the next week or so.
I'm a sucker for updates so I prodded the app and the bike to update, but there is nothing for the EX.
Currently: 1.2.8 for the bike and 2.6.1 for the app.