Later today, when PSN updates, PlayStation Plus members will be able to download the Vita version of Sonic & All-Stars Racing Transformed for free, a recent post on the PlayStation Blog has confirmed.
Apart from Sonic & All-Stars Racing Transformed being added to the Instant Game Collection, the PlayStation Store will have discounts on a variety of titles, including Castle of Illusion Starring Mickey Mouse, Ducktales Remastered, Proteus, Dragon Fantasy and Hotline Miami, among others.
On December 31st, Soul Sacrifice is leaving the Instant Game Collection. For more information about the aforementioned freebies and discounts, follow the link below.
Source: PlayStation Blog