Here are the first 10 units and their (current) stats. Once I finish all 18 or so, I'll post them to the front page as well as an explanation of what it all means.
Certain units will only become available as the game progresses; that is, fighters/bombers will not be available at the start of the game, but biplanes will. Think ~1920 technology for the start date.
Str and Def are Strength and Defense. Depending on whether you are attacking/defending, you use Str or Def for your Hit rolls.
Eva is the stat to beat in order to score a Hit. If Str or Def+1d6 beats the target's Eva+1d6, a hit is scored.
AP is armor-piercing, and is used to determine whether a kill is scored against armored units.
Arm is armor, or how well-armored the unit is - if there is at least 1 Armor, there's a chance that a Hit will fail. It's the stat to beat for piercing checks, which are AP+1d3 versus Armor+1d3. If the piercing check succeeds (AP+1d3>Armor+1d3), then it's a kill.
AA is anti-air and represents the ability of a unit to kill flying units, which are indicated by a small wing-symbol in the top left of the display box. More AA is better air-killing (the exact mechanics are still being worked out), but generally if you have no AA then you have no great air-killing capacity.
Alt is altitude. Still being integrated, but units in higher altitudes are harder to hit by units in lower altitudes.
The yellow money sign and number is how much the unit costs, and the blue arrow and number are how far the unit can move per turn in provinces (or, if an aircraft, how much range the aircraft has in provinces).