*Insert delighted squee here* Southern Barrens!
Unfortunately, it looks like the gazelles and zebras are still out of reach as I haven't been able to find any that are tagged as Wild Battle Pets.
Edit: Spoke too soon! Gazelles in Mulgore! And apparently gazelles and gazelle fawns are two separate types of critter. Cuuuu~ute.
For more new wild pets, check out the Kalimdor thread on WarcraftPets!