The Affinity is built around the CFM56 core. Not a brand new turbofan, just a further development of a massively successful product.
Edited to add: there was originally a lot of vague insinuations about the GE Affinity turbofan in the parent comment, but it was edited down from five paragraphs to one after I replied.
Edited to add: there was originally a lot of vague insinuations about the GE Affinity turbofan in the parent comment, but it was edited down from five paragraphs to one after I replied.