Ok, time for my own prediction
Meta: 72-77 (quite the range but I really don't want to make this more accurate)
Sales: I'd say about 600k first week. Everything after that is really hard judge imo, since it really depends on the reception of the game and wether or not Sony decides to become somewhat aggressive with the bundling for this game, but here's how I see this at the moment:
The Order has been according to developer comments planned as a series from the start, also the game took almost 5 years to make, so it should be fair to assume that there's quite the investment behind hit. Now if the game turns out good and is well received and manages to sell well on its own and make its money back then that's great, the foundation for a sequel is laid, everyone's happy.
But what happens if that's not the case? If the game is destroyed by critics and if sales become sluggish after launch? Will Sony want to continue the franchise in that case? And will they resort to bundling to get the game into as many hands as possible before the sequel hits? I believe they will want to do both of these things.
Oh also it depends on if Sony manages to whip out a good marketing campaign for the game as well, it definitely hasn't been great until now, but maybe the TV spots and the launch trailer will really hit home.
Anyway long story short
2m at the end of 2015
3-4m lifetime.
