The 2. Panzer-Division that will be added is the one of the Wehrmacht not Waffen-SS, right?
Yes, the "Wien Division", not "Das Reich". Heer, not SS.
But what astonishes me is that there is a unit called "Sturmführer". Sturmführer was the officer rank of the Waffen-SS.
(...)
Or are they just named Sturmführer /-grendiere to make a connection to the Sturmgewehr 44?
Yes, the squads armed with StG are called Sturmgrenadier. Sturmführer are the corresponding leaders.
It doesn't imply a SS rank, but
Sturmgrenadier-Führer.
Maybe we should name them
Sturm.Führer to avoid confusion?
SturmGr.Führer seems a little too cryptic and unreadable ...
the guy with the StG 44 on the artwork is wearing a camoflage called "Platanentarn" which was only used by the Waffen-SS.
Couldn't it be the Wehrmacht "swamp" camo, which I have forgotten the name? But you obviously know more than I do on the military fashion topic ...

If so, it is an oversight on our (well, my ...

) part. I can confirm that it is not meant to represent a SS-Man.
Will the Sturmführer and Sturmgrenadiere definetely in the 2. Panzerdivision or will they only available in the coop missions for the "LSSAH" (1. SS-Panzerdivision) and "Das Reich" (2. SS-Panzerdivision)?
Sturmgrenadier/
Führer will be restricted to
2. Panzerdivision.
Feldgendarmerie: a command recon? Recon would make some sense since they acted in small groups and knew the roads very well. Command also makes sense because it was literally their job to prevent desertions and surrenders.
Not recon, but definitively command for they are meant to make sure other troops around them fight "without giving a thought to falling back".
KM Marineinfanterie: if they are the security units of KM HQ in Paris, they'd be quite regular infantry. Perhaps some different equipment like older MGs.
They are scratch/alarm units formed from KM desk soldiers up to that point well settled in Paris ...
ROA: I assume they are the precursor to the Russian Liberation Army (ROA) but how would they differ from the Osttruppen? Or am I completely wrong here?
Not at all, you are mostly on tracks ...
Although not "precursor", they were full-fledged
Russian Liberation Army used in France mostly to destroy Resistance groups. They differ from Osttruppen by being more willing to fight and equipped entirely with Soviet weapons.
There was a full ROA company in Paris during the battle for the city. Historically, they emptied the prison and executed the political prisoners held there rather than take a real part in the fight
Lehr-Pionier: some variation of the Pionier units, but I have no idea what exactly.
That name was actually a placeholder. You'll see what they really are at release ...
Landesschützen: weaker Grenadiere essentially. Worse equipment, disheartened? The 325. Sicherungsdivision is the core of Festung Paris thus perhaps they don't get the disheartened trait.
Mostly right.
Strafgruppe: felons, resistance members, deserters... generally unreliable (disheartened?), ill-equipped, and used as cannon fodder but not necessarily bad in combat performance as some really wanted to redeem themselves. Could do anything with them.
Resistance members? Definitively not, those would have been executed by the Gestapo, or send to a concentration camp after torture in the best case.
Bewährungstruppen (ingame name) are the military personnel condemned to prison time by a military tribunal. By transfering to a penal unit, they are given a chance to redeem themselves and regain not only their rank and awards but also their civilian rights. And that last point mattered more to most than the former, hence those units usually fought ... at least regularly.
Only lightly equipped, they were given the "suicidal" missions, such as clearing minefields, stopping tanks with hand explosives, ...
People usually pictures penal units as a Soviet thing, but the Germans created them and used them in a more cynical way than did the Soviets with their own (which were actually inspired by the Germans'!).
What an intriguing division...
It is. Actually, my favorite of the four.
7th Armoured &
2. Panzer are the "conventional" divisions ;
DBSAS &
Festung Gross-Paris more like patchwork/original ones.
The Russian Liberation Army was founded months after the battle of Paris. I don't think that Eugen means with ROA the Russian Liberation Army.
Avtually, we do.
The
ROA was only
officially integrated as a unit in the German army in late 1944, but it existed as a propaganda tool way earlier than that.
Either referred as ROA or more commonly before that as
Vlassov's Army, they are present in France from mid/late 1943.