1) How many days it takes to get receipt of the new DD ? It varies and you'll probably find better info in the February or March Threads, since they are talking about DDs right now, but it does take a while.
2) If we receive receipt, does that mean that the file is move with investigator analyst or only after you receive mail from OINP ? No, when that happens you MAY receive an email from OINP that you file has moved to assessment phase, but most of us don't receive that confirmation.
3) In the latest draw of IRCC many people got direct ITA whose score was 475 or more, so do you guys think that it will effect the OINP processing or they will do as they are currently? Probably not, what might happen is that people will start to accept direct ITAs and OINP will no longer process their files which will speed up the processing for those in the back of the queue.