All the confirmed information here: https://minecraft.net/en-us/article/all-news-e3
Another literally earth-shattering change: the console editions will now have unlimited worlds. "Really what we're talking about today is Minecraft becoming endless," says the game's executive producer, Jesse Merriam. "As the console editions join bedrock, there are just a number of things they naturally inherit." Console worlds today have a maximum size of 5,120 by 5,120 blocks, or about 3 miles by 3 miles. After the bedrock edition upgrade, players will be able to walk right off the end of an existing world, then keep going.
And Realms, the game's subscription-based hangout for worlds players want to share with others (even when they're not around) folds in organically with the bedrock edition. "All the worlds you've created, all the DLC you've bought come to the new version," says Merriam.
Hope this clears things up