SPOILERS
The bunker has a 5-digit passcode now. The 2nd keypad is still 4 digits, but it has a new layout with breakable supply boxes in it. It also has a walled off with planks, seemingly inoperable door with the same door model as the hidden tutorial door in the previous update.
Likewise the tutorial secret door not looks different and had a 4-digit keypad. No other information is available.
Don't go back to the deer hut.