How many units and resources will the Germans get when they research logistics?
There is not (at least yet) an official, explicit statement for this. For the time before a new FAQ version is released, I would suggest to stick into the Official and Unofficial rules and clarifications made by Itchi (BGG). He was one of the playtesters of the Wisdom &amp; Warfare expansion, and this UFAQ is used in our playgroup if no help is offered by the official rules or the FAQ.


Germans get 3 resources and 3 units by researching or learning Logistics if they havent already unlocked these levels of units. For
example, if they already had Democracy and research Logistics, they
will gain 2 resources and 2 free units (Mounted and Artillery). For
example, if they already have Railroad and Mathematics and learn
Logistics, they will gain 2 resources and 2 free units (Infantry and
Mounted).


Remember, that this is true also even if you have level 3 or level 4 units unlocked. From the official FAQ v.2.0:

Q: If the Germans research a tech which unlocks a level 3 or 4 unit
and later researches a tech which unlocks the level 2 unit of the same
type, do they still get the free unit and resource?
A: Yes