It would appear Sony is sending out invites for its PlayStation Now closed beta. One such invite was received by NeoGAF user tokyostomp, and IGN also claims to have received another, separate invite. Both invites recommend hard-wiring your PS3 and a 5mbps-or-greater internet connection.
PlayStation Now is Sony's premium games streaming service designed to serve up older PlayStation games on PS3, PS4, PS Vita and other internet-enabled devices. The service will allow users to rent individual games or pay a subscription fee.
PS3 is the first system to receive the beta, though Sony hasn't said how long it'll take for the beta to surface on PS4 and PS Vita. An official launch for PlayStation Now is planned for this summer.