Sony's still busy pumping out Ratchet and Clank games in this generation. As far as I know, the HD edition of Ratchet: Deadlocked hasn't been released yet. Like the first three PlayStation 2 hits, perhaps Sony will wait until the time is right to come out with another HD bundle set including most if not all Ratchet and Clank games up to that point?
IDK. I know that Ratchet deadlocked will come to PSN sometime. IDK if there will be a R&C collection 2. In truth, neither game was that great. Only Ratchet and clank size matters is a passable game. Secret agent clank sucked though. So, it's not going to be a good collection.
So, you can either play the recently released Ratchet and clank:Full frontal assault and wait for Ratchet deadlocked. That should do for now.