At the moment all i can see is that this free game is for EU regions and you will be able to grab it in next weeks PS Store update, here is some info from the source:
As usual, over the coming weeks you can also expect exclusive PS Plus discounts on lots of other titles, including Just Cause 1 and 2, Deus Ex: Human Revolution, the Dust 514 Mercenary Pack and Alien Breed Trilogy. We’ll update you on these offers and more in the weekly Store posts. Also, Plus members will have access to an exclusive theme for Ni No Kuni: Wrath of the White Witch from 30th January.
On top of all that, I’m very pleased to announce that as of 6th February we will once again be bringing you a fantastic discount on the 90 day membership for PlayStation Plus. For two whole weeks you’ll be able to get over 30% off the regular price – that’s €9.99/£7.99, reduced from €14.99/£11.99. A bargain, no?
Entering the Plus Service in February:
6th February: Sleeping Dogs
6th February: Quantum Conundrum
6th February: F1 Race Stars
13th February: WipEout 2048
20th February: Lumines Electronic Symphony
Here is a hand tip for you, if you want to grab Sleeping Dogs, without buying a PS+
Grab This Free UK 30 Day PS+ Trial
You will have to enter your Credit/Debit card details, but as long as you un subscribe from auto renew, you will be fine and wont be charged when the free month is over.