They're just prototypes of what will be used in the next add-on retitled (yes...again) Genocide. Except the Hitler one because the game takes place after Hitler commited suicide.

First is the submachine gun wielding guard (to replace big SS guy):

Then the SS Officer (to replace officer):

Then the small Hitler (to replace the ridiculously huge Hitler boss):

And finally the Winter Guard (might replace dog or be a new enemy altogether):

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