“I think the existing, altruistic, free version of Reddit will continue to exist and grow and thrive just the way it has,” Huffman said. “But now we will unlock the door for new use cases, new types of subreddits that can be built that may have exclusive content or private areas, things of that nature.”
This sounds like testing the waters, then dipping their toes, then doing a little splashing. Then jumping right in to completely subscription based.