guess it will be necessarry to create a new world, unless the new biomes will come with hardmode?
My best guess is to get the more popular streamers with the patch before everyone else to give those who watch the streamers an actual look into what is to come, and build up more towards the patch, but I can see why you're upset with this, however the streamers only get this one day in advance, so it could be much worse, and say, the streamers get this weeks in advance. That, would be unfair.Why youtubers are allowed to play 1 day before other people? How their money is better than our money? Disrespectful for fans that waited so long for it. They should begin playing same hour as other players. Scandal.
Here is something else that is good to consider;Even popularity does not give them right to play faster than people who paid.