'Free' upgrade to PS4 versions of Watch Dogs, Battlefield 4, and others

As the official PlayStation Blog explains, from now until October 29, you can earn $10 for every $50 spent on any PlayStation Store content. That includes a multitude of Day 1 Digital titles, like Call of Duty: Ghosts, Battlefield 4, Watch Dogs, and Assassin's Creed IV: Black Flag.

There's a lot more on offer, including an extensive list of pre-order bonuses for Day 1 Digital titles, but there's something special about these four games in particular. Each has been confirmed to support an upgrade to the digital PS4 version for only $10--the same amount of money you'll now get as a rebate for buying or pre-ordering a Day 1 Digital game before October 29.

Will you buy any of these games, knowing you can get the PS4 digital version for "free"? Let us know in the comments below.