Hey Shane,
No, all current SItePoint content stays free as it always has been - we’ve added a bunch of new content and books to Premium (along with Partnerships with A Book Apart and UX Mastery) and we’ve started to create new content types like Screencasts, of which there will be free and paid versions.
We’re still totally committed to creating the best free content for web developers and designers, we’ve just added another layer to that with Premium