The current release of the language is P416.
The previous release of the language is P414.
The current release of the Portable Switch Architecture
In-band Network Telemetry (INT), working draft: [PDF]
Telemetry Report Format, working draft: [PDF]
An archive of older versions of the language is also available. Note that these releases should be considered deprecated.
If you have feedback, questions, comments on the specification please join the p4-discuss mailing list!