When you look at the unit information in the pedia you'll see it gets such and such from this unitcombat, such and such from that unitcombat... it's a bit of a list to scroll through. When you look at the unit information on the help hover you'll not immediately see these unless you cycle through each unitcombat by holding (shift is it?) to see the unitcombat list and then moving the mouse off the unit then back onto the unit - each time you do this it opens up a different unitcombat's full modifier list. Thus its easier to look in the pedia where you can scroll through and see all the modifiers coming from the unitcombats on that unit.
Those modifiers from unitcombats never tally into the total of the unit details until its manifested into the game, until its trained and is a unit in the game now. So if the unit is getting a +1 movement from a unitcombat, the hover will say its got a movement of 2 while the unit, once in the game, will give accurately that its movement is now 3.
units they no longer need those promotions. 
