Still in 1.8.1-pre2.

Confirmed for 1.8. Also happens with Blindness and Nausea. However, if the player has Night Vision or Nausea, then they will see its effects while spectating the mob regardless or the mob's potion effects (also the sky won't change color for Night Vision.

Does this occur with darkness as well?

The particles are coming off my spectral body. There is no actual night vision effect however.

why do the other new 3 pictures have night vision?

I see, like this it can be confirmed

I also noticed that you can inhabit ANY entity, even fireballs. I attached a picture that shows me spectating as one of the fireballs that I created in MC-56831.
( https://bugs.mojang.com/browse/MC-56831 )

What is this? I still don't have night vision as a fireball?

-I attached my view as a leash knot as well.
-I'm attaching a "selfie" I took as an item frame (which contained a guardian egg, FYI).
-Another Selfie...this time as a minecart spawner that looks like a minecart furnace!

true

Currently, the only way to see mob filter + night vision is to use super secret settings. I think it would be amazing for Mojang to go the extra step and make spectators have the same visual potion effects as the mobs they impersonate.

I also noticed that if I, under the effects of night vision, inhabit an Enderman, and press F5 either once or twice (to go into 3rd person views), there is no filter and no night vision.

Also, when I applied ANY filter, inhabit a mob (which switches to that mobs filter), and leave, I no longer have a filter...

Seriously, I think it would be loads of fun to use spectator if all this was fixed...

that's weird