After how well Infamous SS sold, I don't see why anyone would think that another similar Sony 1st party game would not be similarly successfully.
Even Killzone was a million seller, and that was the worst AAA game I've played in a very, very long time, with poor word of mouth and less than stellar reviews.
The jury is still out about whether The Order will be a good game or not, but it's a shoo-in that it will sell well.
It's a new IP. Infamous was the third game in the series. It's not exactly comparable.