In ETK we see Khyber Paragon Kobolds, what about PC Siberys Paragon Kobolds?
The Kobolds in ETK are corrupted by the energies of Khyber, so perhaps PC Kobolds could be Uplifted by the energy of Siberys (possibly as a side effect of all this Dragonshard collecting...)
With that sort of backstory/justification, we reskin PC kobolds slightly (let the art department do some showing off), to make them look more like sleek versions of the Paragon kobolds, and less like scaly rat/kender. Under the influence of Siberys they gain +2 Cha, +2 Wis, -2 Int, -2 Str.
Favored/Racial PrE: Defender of Siberys (existing) or Dragon Disciple (new)