ORIGINAL: Ace1
It was always that way. Units sitting in a region adjacent to depot would always receive supplies from that depot.
About supplies moving overland, it all depends on the movement cost. If supply wagon unit can travel from depot to target region within 15 days, depot can push the same distance as well.
The change is supply wagons, apparently they push supply to adjacent regions now just like depots.
Here's the wiki entry:
Supply Wagons
Supply wagons are special units which act as moving supply stockpiles and thus provide you with limited direct control over supply. They fill up during the supply distribution phase. Supply wagons allow you to keep selected forces supplied, even if they operate far from their supply bases. However, this will only last until they become empty and need to be resupplied themselves from a regular supply source.
Wagons tend to slow down the force they accompany and cannot be used by naval units.
Supply wagons also have the following additional benefits:
## They provide a +10% fire bonus during battles (provided they have some ammo left)
## They protect units from bad weather effects by trading hits for supply
A supply wagon or transport ship is able to supply any land unit with both General Supply and Ammunition if it is
in the same or an adjacent region.
Note: If you have too many depleted supply wagons near the front, you can move them back by train to rear areas stockpiles so they get replenished. This is the manual means that players have to control precisely where they want supply, most of the micro-management burden being taken by the automated supply distribution phase.
Jim