Its their own blog. I think its ok to be writing about every feature they build on the blog even if its a simple feature.
If not many people find it interesting it won't stay on the front page for long anyway.
Apple announces new iPhone, listing specs. Should it be on HN?
Google announces new service. Should it be on HN?
In general, if it's something tech related that the community finds interesting, I don't see why not.