UPDATE: Sony has confirmed that Metro: Last Light, BioShock Infinite, Dynasty Warriors Next and ModNation Racers: Road Trip will be available on PlayStation Plus from January 29, with Outlast following a week later on February 5.
And if you've yet to download current PS4 freebies Don't Starve and Resogun, get to it. Both of them will be removed from the service on February 5.
Leaving PS Plus:
29th January: DmC Devil May Cry
29th January: Remember Me
29th January: Sonic and Allstars Racing Transformed
29th January: Blazblue Continuum Shift Extend
29th January: GTA Liberty City Stories PSP
5th February: Don't Starve
5th February: RESOGUN
Entering PS Plus:
29th January: Metro Last Light
29th January: BioShock Infinite
29th January: Dynasty Warriors Next
29th January: ModNation Racers: Road Trip
5th February: Outlast
ORIGINAL REPORT: Next month's PlayStation Plus games appear to have been confirmed via a rogue ad on Sony Entertainment Network.
The ad (spotted by The Sixth Axis) lists the PS3 versions of Metro: Last Light and BioShock Infinite, and PS Vita versions of Dynasty Warriors Next and ModNation Racers: Road Trip as "coming soon" to PlayStation Plus.
The games are expected to be joined by PS4 first-person horror Outlast later in the month, with Sony expected to confirm the full line-up on PlayStation Blog tomorrow.
Sony has yet to comment on the leak.
Source: sonyentertainmentnetwork.com, thesixthaxis.com