The Tempestus Primes will soon be able to give orders out within their detachments, and use orders like First Rank Second Rank with hot-shot lasguns. The good times are about to roll.
Please take these as rumors until we have an official release.
via an anonymous source on Faeit 212
An article in the upcoming White Dwarf mentions that First Rank Second Rank Fire will be available for hot shot lasguns out of the upcoming Astra Militarum codex.
In addition the Miltarum Tempestus codex will contain 6 orders for Tempestor Primes to issue within a Militarum Tempestus Detachment.