So this will be simple enough. Each company are going to try and hit us with as much first party/exclusive goodness as they can.

In this topic we name 3 for all 3 of them. Hoping to see only predictions that we don't know are a guarantee. It can even be things you're hopeful of seeing even though they don't seem likely!

Without further delay:

Nintendo:

1) Metroid U

2) Pokemon Z

3) Zelda U (They specifically said this would not be shown, but I'm calling them out on this one)

Sony:

1) God of War 4

2) Gran Turismo 7

3) Some form of Silent Hill (We may have had one canceled recently but maybe there's a remake or something happening)

Microsoft:

1) Banjo Threeie (They're gonna do it/wishful thinking)

2) New Gears of War? (Could be ready by then)

3) Battletoads!

Some of these are possibly guaranteed to appear for all I know, but let's do this anyway!

Nintendo
1. Pokémon Z
2. Paper Mario U
3. Fire Emblem U

Sony
1. New IP
2. Gran Turismo 7
3. God of War 4

Microsoft
1. Gears of War 4
2. Quantum Break
3. Halo 5

Nintendo:
Paper Mario U
Pokemon Z
Super Mario Strikers 3ds

Sony:
Gran Turismo 7
Infamous 4
Santa Monica IP

MS:
Halo 5
Halo 5
Halo 5
and lots of minor exclusives that will be overshadowed by Halo 5.

For Nintendo I can also see Animal Crossing U happening for sure as well.

Animal Crossing and Paper Mario U, how could I forget!

Nintendo
1. Paper Mario U
2. Animal Crossing U
3. Metroid U

Sony
1. Gran Turismo 7
2. The Last Guardian
3. Santa Monica IP

Microsoft
1. Banjo Threeie
2. Gears 4
3. Halo 5

You went there :o

There's absolutely no way TLG won't be at E3, I tell you!

We can only hope you're right about this :p

Sony:
Horizon announcement
New horror game from Sony Bend
New creative game from Media Molecule

Microsoft:
New Gears of War
New game from Rare (I guess Banjoo-Kazoie)
Halo 5

Nintendo:
New Pokemon
New Metroid
New DLC's for Smash