The most up to date information on what animation priorities are used are in the #documentation-reference channel
https://discord.gg/RuGR4eUkYH


________Information for version Day 0 Release____________

Using .anim is recommended

Hover is at priority 3
Flying is at 4
Flying and turning is at 5
Prejump at 4
Jumping at 3
Stands/Idles at 3 (to override SL breathing. Ear+facial animations should be avoided to avoid conflict)
Sits inside chairs 4
Sitting at 3 (4 if youw ant to use pupils and COG)
Tails at 2

Facial animations require bone translation on to be exported properly

___________Preset Facial Layers___________

mouth (priority 2 preffered)
eyesL(priority 2 preffered. includes eyebrow and pupil movement)
eyesR(priority 2 preffered)
browsL(priority 3 preffered)
browsR(priority 3 preffered) (blink anims control brows at p2)
earsL(priority 2 preffered)
earsR(priority 2 preffered)
wingsL(priority 2 preffered)
wingR(priority 2 preffered)
pupils (used to control eye wandering, priority 3. do not use)
face(priority 3 preffered, intended for mouth,eyes,brows,pupils, ears)
emote(priority 4 preffered)
blush(textures the blush layer, format: blush-UUID)


___________Post Release Edits___________

Added a paired file, for animations with one other pony. If you need more, you should be able to duplicate the armature. 
For example, making a carnival stack of ponies that balance on eachother, will need you to duplicate the armature
Be advised, this will also duplicate all the animations, like how it is in the current file.

The file has two overlapping ponies on top of eachother.

Keep in mind the Origin bone does not translate into SL, use COG + the IKs to move everything instead.

Added Wrist/alternative IKs, 
Extended Leg IK and Shoulder IK to use said wrist method + new method to reduce popping in exchange for accuracy

Only Animation files were effected.

Preset tail file merged with full file.