Just to be really sure, and not be disqualified "before" the jam starts, a couple of questions:

What can I work on before the jam?

You are allowed to set up your tools and your game engine. Tools include: palettes, fonts, tracker instruments and code libraries. Anything that is specific to a particular idea should wait until the jam starts.

Does this mean i could already setup a gitrepo for me and my team today? At this time i don't have proper templates, so i'd love to avoid going through all that hurdle tomorrow. 

Same for Unity project. That could also be created, and some basic project settings be done?

Regarding these sections of FAQ:

Making Things

All game-specific code, audio, and art assets must be created by you and your team during the jam period. You may use pre-existing fonts. Any game engine features and code libraries for general utilities are also allowed.

Can I use public domain assets?

No. Music, art and programming must be provided by the people entering the jam. This is to encourage teaming up with other users to make the best game you can!

So i could also import engine stuff like input/camera (without setting things up), my own simple "event framework"(some event channels for work in editor, so not everything has to be scripted) or some script to strip development and platform specific stuff from builds, but no libraries from 3rd party, even if public domain (e.g. some tweening, editor buttons or whatever).

It's the spirit of jams to only work in that time, and with the things you made during that period, i know. But some basically "empty" project setup to start with is ok?