Doing a quick bit of math, and a few 'natural' assumptions, I think we can pin down the racial attribute mods for the characters we see.
Dwarf Fighter - If you assume that Str and Con are the Dwarf 'bonus stats' (and that each race gets two), then her stats cost 6+10+4+2+6+0 = 28 points.
Half-Elf Warlock - Again, assume that Con and Cha are the bonus stats, and you get 2+6+3+8+0+10 = 29 points.
Tiefling Wizard - Assume that Int and Dex are the bonus stats. 2+2+4+16+1+4 = 29 points.
Without doing a bit more detailed analysis (LP FTW!), I think this is the best we can figure at this point.