I think the orcs had a charge mechanic in the first playtest. They didn't gain any distance in the charge, but they got extra damage on a hit, but the charge granted anyone who attacked the charging orc that round "advantage." Personally, I don't think that that mechanic worked too well for the orcs.
I also think that the most important part of a charge is granting extra movement (and perhaps extra damage from the force of the blow). Granting advantage to others who attack, or having the charger attack at disadvantage seems too big a penalty though.
Maybe "charge" will be another way to use fighter expertise die. If the fighter could double his or her move by using an expertise die, that might work. Then, at higher levels a fighter could charge and add damage using more than one die.