I think many of those XP values are estimates - likely any fractions will simply round down. My understanding is that the characters were made with 28 pt. buy and that a few are 29 pt. buy by accident (they also have odd numbers that can be easily changed without impacting anything on the rest of the sheet). Keeping that in mind, I think it's hard to say what the stat boosts are for many of the races. We've seen some of them, and others can be deduced from the stats, but many are questionable. The Human probably gets a bonus to any 2 stats, but that could be restricted in some way (must be 1 mental and 1 physical, for example). The Dwarf, if it is a product of 3e style pt. buy, is getting a +2 to Str and Con or a +4 to Con. Those are the only two that work and make sense. The halfling is almost definately getting a +2 to Dex, but he is also getting a +2 to Wis or Cha (I'm guessing Cha). The Eladrin is a +2 to Dex and probably Int. This is all partly guess work though.