This took 20 years in the making I think only they made limited amount of these set books.
I dont think that 2012 thing is accurate because Lord Kalki is going to be born still long time away right now this is still the start of the Kali-yuga and he will come nr the end time.
The Srimad-Bhagavatam (12.2.19-20) describes Lord Kalki's activities as follows: "Lord Kalki, the Lord of the universe, will mount His swift white horse Devadatta and, sword in hand, travel over the earth exhibiting His eight mystic opulences and eight special qualities of Godhead. Displaying His unequaled effulgence and riding with great speed, He will kill by the millions those thieves who have dared dress as kings."
The Vishnu Purana (Book Four, Chapter 24) continues to explain Lord Kalki's activities: "By His irresistible might he will destroy all the mlecchas and thieves, and all whose minds are devoted to iniquity. He will reestablish righteousness upon earth, and the minds of those who live at the end of the Kali age shall be awakened, and shall be as clear as crystal. The men who are thus changed by virtue of that peculiar time shall be as the seeds of human beings, and shall give birth to a race who will follow the laws of the Krita age [Satya-yuga], the age of purity. As it is said, 'When the sun and moon, and the lunar asterism Tishya, and the planet Jupiter, are in one mansion, the Krita age shall return.'" The Agni Purana (16.10) also relates that Hari, after giving up the form of Kalki, will go to heaven. Then the Krita or Satya-yuga will return as before.
Attributes of Kali Yuga
Rulers will become unreasonable: they will levy taxes unfairly.
Rulers will no longer see it as their duty to promote spirituality, or to protect their subjects: they will become a danger to the world.
People will start migrating, seeking countries where wheat and barley form the staple food source. But then, they will also love their subjects so much that they will sacrifice their lives for them. This is what kaliyuga says.
The end of Kali Yuga
"When flowers will be begot within flowers, and fruits within fruits, then will the Yuga come to an end. And the clouds will pour rain unseasonably when the end of the Yuga approaches." Then Lord vishnu in the form of infant krishna on a leaf will come to earth and again everything will start producing from the begining.