Depending on the leak, it would be a package of four series parcels.
du Entertainment Software Rating Board (ESRB) classification Serious Sam Collection In the version of PlayStation 4 and Xbox One, it clearly indicates that the collection of games will be released in the aforementioned consoles.
This title collection was released in previous versions of PlayStation 3 and Xbox 360 and includes a single package Serious Sam HD: The First Encounter, Serious Sam HD: The Second Encounter, Serious Sam 3: BFE and Serious Sam: Double D XXL, so it would be interesting to watch at the current generation consoles, so that you can revive the adventures before reaching the new delivery.
It is worth mentioning that the classification "Mature" of Serious Sam Collection nowadays suggests that the classification bodies use firearms, there is a presence of blood and dismemberment, including drug references, nudity, partial language use and inadequate for minors.
All this said, Devolver Digital and Croteam are waiting for the official statement of this note.
And, in this case, forgotten, I remind you that Serious Sam 4: Planet Badass is being developed for the computer, although it is still not allowed.