Awesome idea to hold a game jam, looking forward to see the games that are going to be made for it. That being said, I'm looking to team up with a 2D artist/animator for the jam. Preferably someone from Germany, Rheinland-Pfalz or close by (who speaks good English :D ) so we can get together a few times. Not really experienced with Unity, nor Unreal, my main development engine is Löve2D, but I can safely say that this engine is perfect for 2D games of all kinds.
So if you are looking for a programmer buddy and you have a storm of ideas in your head like I do, join me to make an awesome game :)