The end of the year is coming, but that is not why things are slowing down in Cupertino, because the HomePod, which was to be launched in December, arrives in early 2018, so there are a lot of people working overtime there! And one of the reasons why Apple already makes available the first test version of iOS 11.2.5 (build 15D5037e) may be the operating system's support for the new product.
There are also features promised for the eleventh version of iOS that have not yet been released, such as iMessage on iCloud (which will now sync all of its messaging history on Apple's cloud service.
In addition to it, Apple also made available the watchOS 4.2.2 beta (build 15S5530d) and the tvOS 11.2.5 (15K5531d), which most likely only have general improvements and bug fixes.
Now, the reason for this numbering (jump from the current iOS 11.2.1 to 11.2.5, from watchOS 4.2 to 4.2.2 and from tvOS 11.2.1 to 11.2.5), is only Apple to answer
Systems (with the exception of watchOS) are expected to paint soon in the Apple Beta Software Program; stay tuned! And, as always, if relevant news appears in the versions, we will update this article with all the information.
Update 12/14/2017 s 16:58
IOS 11.2.5 and tvOS 11.2.5 are now available in the Apple Beta Software Program.