Here is Novosibirsk's news in Russian:
Новосибирский зоопарк
Зоопарк показал первые фотографии лилигренка — НГС.НОВОСТИ

Quote Originally Posted by Hanna
But why did they give it to a cat to raise? Why not the mother, or at least a tiger or a lion....?

This sounds like something out of a children's story "The animal that didn't know what it was..." He is not a lion, a tiger or a cat!
I hope there is another creature like him somewhere...
Actually, the reason was simple: The mother lacked the mother's milk. So the liliger was fed by humans with artificial milk and the house cat was just to make a company and some sort of cat's care.