I did not get an email but the PTU is available on my account page  8GB download.
When did this happen  have I been missing out?
https://robertsspaceindustries.com/roadmap/board/1-Star-Citizen
		 
		
	 
You didn't miss much, just an eye-watering QT bug.  It's still a little buggy, but it's working at least.  Something I really like is the ability to QT close to the surface (60-75 Km's), even to locations that are over the horizon.  All in all, the changes to QT were really nice, and they got it almost right.
Mining is great, it doesn't even matter if you screw up and explode yourself right now, it costs you nothing but time.  
They also turned trade back on for those who want a bit more risk (you can make more, but you need to invest in your load, so screwing up can cost you.)  There are still a few bugs with Grim Hex too.