As we move over to the new host, most things for visitors shouldn't change, except a more seamless, smoother, and better design experience including - and especially - on mobile. Comments will remain with Disqus as they are now, so you'll be commenting the same way as well. My understanding is that we should not lose existing comments, either.
I didn't just willy-nilly go and pick a new host. I have done my research, and Square Space has all the right tools for the next step in TPV's journey. Thank you everyone for coming with us as we go through the transition for a better - and hopefully bigger - TPV!