Our upcoming quarterly update on communication chips reveals that EPON is selling much more than GPON. Apparently GPON is not so hip among the carriers. EPON is integration of Ethernet with PON and carriers are already familiar with Ethernet. On the other hand, GPON solutions are much more costly than EPON and this is going to remain so for a while.
Options available to deploy PON include EPON and GPON. GPON is in no way an evolution over EPON or some sort of replacement or upgradation for the latter. Carriers have in fact shown preference for EPON.
EPON is a more mature technology than GPON and conforms to ITU standards. EPON is serving the needs of carriers well, both for homes or Multiple Dwelling Units (MDUs). EPON is primarily pushed by mid tier vendors like Teknovus and PMC-Sierra. They are much more focused on the product as compared to the attention GPON receives from larger vendors.