To quote: Thank you very much for your interest in the Developer Program for PlayStation Suite (PS Suite). The Developer Program for PS Suite will provide content developers PlayStation Suite SDK (PS Suite SDK), a set of development tools and software libraries.
We will release the open beta version of PS Suite SDK to content developers in April 2012 and the official version later this year. Contents developed with the official version of PS Suite SDK will be distributed through PlayStation Store and can be enjoyed on PlayStation Certified devices, as well as PlayStation Vita.
Please refer to the GDC 2012 presentation slides (PDF 4.7MB) for details.
Finally, from tthousand via PSX-Scene (linked above) on the SDK contents:
PS Suite Studio (IDE based on MonoDevelop)
PS Suite UI Composer (UI Design Tool)
Library (Core APIs, High Level APIs)
C# Toolchain (compiler, linker, etc.)
Demo Games, Demo Applications
Note: Currently, only Windows environments are supported
Stay tuned for more PS3 Hacks and PS3 CFW news, follow us on Twitter and be sure to drop by the PS3 Hacks and PS3 Custom Firmware Forums for the latest PlayStation 3 scene updates and homebrew releases!
You CAN run the apps (either your own or demo apps supplied with the kit) on any Vita but ... not directly but via supplied launch app Called PS Suite Dev and it will indeed guard what and where exactly are you running.
Also - once the beta will end you'll be unable to do so without paying the yearly fee of $99 which though (comparing to usual dev kit prices) is still peanuts if you're really interested in developing and you can actully even get your final product(s) published (and sold) on PS store - sweet, isn't it?
Theoretically - as long as Sony will not block it in some way (or link your kit to your particular Vita) you should be still able to distribute the SLN project to others to use it via Dev app but they'd need to purchase the $99 license as well to be able to run it, but there is no way of producing the "native" signed Vita app with this directly.