Anything that is generated when you first create a seed will not be added to existing worlds, ores, structures, what have you. New crafting and game mechanics will be available on previously generated maps. For example: a new block like granite will not be found on an already existing map, water temples won't be on those seeds either. However, on an existing seed you will be able to use new recipes such as crafting slime blocks, newly spawned villagers should have professions, enchanting will follow the new mechanics, etc.
Gotcha. That's make sense. Thank you for the reply.
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Bettie Mae Page "Queen of Pinups" April 22, 1923 - Dec. 11, 2008
“We’re all going to die, all of us, what a circus! That alone should make us love each other but it doesn’t. We are terrorized and flattened by trivialities, we are eaten up by nothing. ” -- Charles Bukowski