Looks really clean and nice. Great stuff.
How do you plan to monetize it? It says "in app purchases" but couldn't spot any paid-for options.
A few small comments:
* The login option is slightly confusing, because it has a big Boreal on top. Am I logging in / creating an account for Boreal or HN ?
* On the announcement blog post you have a typo "So, what do you l[o]ose trying it?", and I think you should anyway say "What do you have to lose by trying it?" (I'm not a native English speaker though).
* I wish there was a way to jump straight into the comments. It's not uncommon for me (and I believe others) to start off by reading the comments, and only then the article.