Prof.NightJack 
"[@Background Pony #6AE2":](/1438086#comment_6129703
)
If you count the announcement one it is two.
That one only showed text and the logo, the first teaser showed ponies.
And it's not always easy to find announcement trailer because they tend to be nothing worth nothing, some music, maybe a sound effect or two, then text saying about when it's coming and a logo/title that isn't the final version.
You can take a single screen shot from them, the point when the logo in on screen, and it has the same effect.
Gizmonics Scientist
If you count the announcement one it is two.
That one only showed text and the logo, the first teaser showed ponies.
And it's not always easy to find announcement trailer because they tend to be nothing worth nothing, some music, maybe a sound effect or two, then text saying about when it's coming and a logo/title that isn't the final version.
You can take a single screen shot from them, the point when the logo in on screen, and it has the same effect.