http://arstechnica.com/gaming/2016/0...ms-now-online/
"Sony has responded to today's influx of No Man's Sky gameplay videos by essentially describing the on-disc version of the game as unfinished. The company's statement confirms that "a significant pre-release patch" will go live on Monday, August 8, and it will represent "a culmination of the studio’s day-1 aspirations."
Edit: Only online discoveries are being wiped from server apparently. So progress shouldn't really be lost though its hard to say if its just a miscommunication or not.