On November 5, it was announced that the future and expected Debian 9 has already entered the freeze phase, a phase that is the pre-launch stable phase of the application, which has no date yet.
A freeze phase is a gradual phase, in which all packages in the distribution are "frozen", that is, no further changes are allowed to them unless they are intended to correct serious errors.
The phase started last day 5 and It will be extended until February 5, in which Debian 9 will be totally frozen. This phase in turn is divided into different transition phases, in which the developers of the packages are asked to make their packages final.
This phase it is very important to develop an operating system, since it allows a certain control over the packages that are going to be installed. Since an operating system has so many packages related to each other, modifying one of them can affect the operation of the entire distribution and force changes to all packages.
For this reason, it is "frozen" so that all packages can be tested and checked for stability as soon as possible. As changes are not allowed except due to force majeure, the only task that those responsible for development will have to do is to check that everything is going well.
Once it has been verified that everything is going well and that no security changes to be made, the distribution comes out as a stable version. In the case of Debian 9, at the moment we do not have a fixed date, but I estimate that it will be released approximately for summer dates.
That if, although we do not know a fixed date we will be covering Debian 9 news at all timesor, so when something is known you will be the first to know as always.