as a reminder for myself and a few others, here is a list of the notable vanity pet-related changes, updates, and additions for the upcoming patch: 4.1 overview.
a couple extra things to note - the whereabouts of mojo
UPDATE: as detailed in this post's comments, the hex sticks still drop from ZA post-patch 4.1. however, due to the change of the dungeon, a lot of the trash packs have been removed or cut down in size, making the hex sticks a rarer drop. i would still recommend players farm for mojo ASAP for this reason. also, once the instance has been transformed, it will be unlikely that players will be able to solo-farm for mojo after the patch (at least for a few gear tiers or so) due to the increased level and difficulty of the mobs.
in preparation for the two new archaeology companion pets, i suggest that players max out their fossil and troll fragments now (cap is 200). then once the patch is released, you'll be ready to solve at least a few items and hopefully one of the new pets pops up for you to complete!
for those wondering about the lashtail hatchling... possible spoilers behind the break!
"ohgan'aka, the young raptor, looks at you with pleading eyes."
during the upcoming level 85 zul'gurub quest chain, the lashtail hatchling makes a brief appearance! of course she's still being held captive by the trolls, but this emote is a definite indication that she has not forgotten you. :)
i have yet to complete the new zg on the PTR, so i can't say for sure whether or not players who have completed the lashtail hatchling quest chain will be able to save their little friend, but hopefully the new five-man zg will at least give players some closure.