Shemeska
Adventurer
IIRC, in the playtest document 2e's Tieflings were renamed as "Planetouched" and are a blanket category for "humans with extraplanar blood". The Tieflings in the PHB will be probably 4e ones.
I know, I'm just hoping that they don't make that mistake. It's just a lot more respectful to the history of the game to keep the classic tiefling as the default one.
The 2e/3e tieflings have a longer history and larger amount of material written using them than the 4e versions, the 4e versions are very different, and "Planetouched" has already been used in the past to mean something very different than the proposed 5e meaning (it collectively referred to any mortal with a fraction of outsider or elemental blood: tieflings, aasimar, genasi, etc).