There aren't many articles on Sphinx since
the commit was created 4 days ago. Lightning Network invoices contain a lot of important information which is required for sending a payment (destination, payment hash, number of satoshis, expiry, timestamp and cltv expiry). In Spinx, invoices are replaced with
the EOB which allows to encode extra data for the receiver. That is what I managed to conclude from the available information. Please, correct me if I am wrong. I will continue my research tomorrow.