It's the same release model as Chrome. Chrome doesn't go from 10.1 to 10.2 to 10.3... It's a time boxed release. 4-6 times a year you get an automatic upgrade and the version number is increased. They could have chosen the smaller increment like 10.01, 10.02, ... but then we would never have a major upgrade, and I think humans prefer the major upgrades numbers. In reality, it's just a number. They could have started with 3.14 and added the numbers of Pi, but that's already been done.
The expanding-decimal notation is very appropriate for TeX, because its implementation is just converging to the behavior specified in the TeXbook (i.e., pi), not adding features.
I wish the lesson learned from Chrome was that version numbers don't matter. I think it's unfortunate that some people have drawn the exact opposite conclusion.
Sadly, there isn't much to write about because there isn't anything new here. As far as I can tell, tech blogs don't write about Chrome versions anymore -- I don't even know what number they are up to.
12 is the current release, and 13 should be ready soon. One thing chrome has done really well is smooth and seamless upgrades, this helps them move things forward and people don't notice the version numbers crawl up.
They're going to make four releases a year, so there will never be another major release. Sticking with the old numbering scheme would result in "deflated" version numbers like 4.39.
