Its an mini-update that fixes the bugs of the main update the preceded it (787).
A hotfix is a quick bug fixed implemented into the app. This may help:
It’s an update fixing something that was unexectedly broken and affects the mechanics and ability to use the application. It normally doesn’t changes how or bring anything new. Just what needs fixing or replacing in the coding or User Interface
Not really Infinite Flight related. Also, please do not use a lot of question marks as you did above. Instead, write complete sentences. ;)