As Facebook launched at google play on april 12th, they are many discussion about Facebook Home. Most people said they will not install it for it will bring ads, only people said they will give a try.
And it is said that Facebook Home not likely to appear on iPhone.

It will not come with any ads and for iPHone, then iPhone lover with love with facebook will feel discouraged. I think it is good sign that apps are coming first on Android because it was used to iOS first in past.