Happy to! The ability to embed authenticated apps is our current priority - we're actively working on this and will likely ship it in the next 6-8 weeks.
On the subject of true public apps, our Product team is still gathering use cases and is generally being very intentional about figuring out the right implementation. Public apps, by their very nature, have the potential to be abused as either a phishing vector or workaround to our seat-based model, both of which we'd like to prevent.
I am continuing to push on this internally and will provide an update here as soon as I can!