For those unaware the Sly Trilogy and Dead Nation have been added to the PS Store today for the PS Vita.

Both these titles are Cross buy if you have a digital version for the PS3.

I bought the Sly trilogy for PS3 many months a go when it was in a sale and just downloaded the Trilogy for PS Vita free of charge.

Dead Nation was 1 of the free PSN games to choose from when the PSN was back up and running after the hack, I didn't get Dead Nation for the Vita as I didn't choose this title out of the few available.
Or you will obviously get the Vita version if you have bought the PS3 version at some point.
Also, this is not PS4 cross play if you got the PS+ Apocalypse edition.