"The Ratchet & Clank Trilogy will be released on Wednesday 27th June across Europe, Thursday 28th June in Australia and New Zealand, and Friday 29th June in the UK and Ireland." -- From the Playstation Blog EU
Also, Idol Minds is releasing the collection, not Insomniac, though they are involved. The US version is set to release late summer / early fall. Additionally, no Vita version is currently planned.
I Pledge to Go Commando On September 20th
The info seems to line up. It's a pretty wild speculation, but Jak 4 rumors have been flying around for 8 years now.