Are there plans for more post types?
I think there should at the very least be a third option; "discussion".
Comments
The whole site is a discussion with threaded commenting everywhere. What is the distinct UI or behavior you're envisioning?
It's about more than function. Question and Article are pretty specific and I feel like many things won't fall into those categories. Here are a couple examples:
What is your favorite public cloud provider and why? (Discussion)
Development teams and namespaces (Discussion)
Getting my head around a class model (Discussion)
2015.1.4 maintenance release now available (Announcement)
Alert: Incorrect SQL Results (Announcement)
And honestly I'm generally not interested in articles, nor do I have time to read them. It would be cool to just view all questions or all discussions. So that's one functional reason.
Also there is already a Find > Articles/Whitepapers menu option. What is the difference between those articles and post articles? Just another related aspect that should be considered.