This official poster for The Mandalorian has a couple of details I believe may be important.

At first glance, it seems that each character is looking in the same direction, however you can see Bo-Katan has her head looking slightly to the side. You can also see Din's head tilted slightly in the direction Bo's helmet is facing. This is representing the fact that unlike The Armourer and Paz Vizsla, Din is opening up to the idea that the ideologies he grew up learning may not be the only 'way' of the Mandalorians. The poster is showing how Din is leaning both physically and metaphorically towards Bo's Mandalorian ideology. 

We have begun to see this in the second episode of season 3 and when Bo mentioned her fathers sacrifice, you could tell it meant something to Din and he had a genuine respect for the sacrifice. I think we will see this largely play out over this season and perhaps the seasons to come. 

Overall its a nice poster and interesting that they digitally added a brush-mark effect to it, never seen Lucasfilm do that before. I wonder if that may have some significance, like that Din and/or Bo will paint over the past and old Mandalorian ways, making way for the next generation of Mandalorians...