The speculation is that humans get +2 to any two ability scores, or possibly to one physical and one mental ability score. I based these characters very closely off of the pregenerated characters from D&D Experience. The pregen tiefling wizard has Intelligence 20, because tieflings get +2 Intelligence and +2 Charisma. I simply gave the human wizard +2 on Intelligence and +2 on Wisdom. I switched the tiefling's Wisdom and Charisma score and the tiefling's Dex and Con scores when making him Human.
For the fighter, I based it off the pregen dwarf fighter. Dwarves get +2 Con and +2 Wis. I gave the human +2 Str instead of +2 Con.
In
4E, all races are basically LA +1 compared to 3.5 races. That is reflected in their ability scores as well.
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