Stealth while mounted

[Substetly]

After an arena match this happened -

[Henhouse]

Nothing major. If you enter a BG or arena on your mount, you're restored to where you last were and last mounted on, a feature to function like it did in Wrath. So if you leave while stealthed, you'll return mounted and stealthed. But you cannot use this in a BG or anything so it doesn't really pose a threat.