It was the support patch for the Star Wars skin pack. For some reason they've switched to making everyone download the packs on the Xbox One when they're released. Noticed when I went to buy it and didn't have to download it.
Actually, I checked to see what version the fishing update was and it was 1.7.4 so we may not see it for awhile. Next update will only make us the equivalent of 1.6.4
Spawning rules are different on the console editions, mobs don't just spawn during world generation. They spawn randomly much like hostile mobs do. So horses will be possible for already created worlds.
I loaded a transferred 360 world to my Xbox One and played on it for a few days. I loaded it up again a few days ago to find that all my villagers in two different villages had been duplicated and that each one of them had an identical "twin". They even had all the same trades open as the original.
I had the same thing happen with my villagers. I loaded a transferred 360 world that I had played on before and suddenly all my villagers in two different villages had duplicate "twins". Identical copies right down to the trades they were offering.
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https://twitter.com/4JStudios/status/537292981191983104
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https://twitter.com/4JStudios/status/537292981191983104
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