This movie's title cards are just about all shown

Is Steeply supposed to be Tiresias? In Greek mythology, Tiresias is a prophet who was born and died a man, but who spent some time as a woman after striking copulating snakes.

Steeply's a man, but, for cover, he dresses as a woman and is convincing enough to fool Orin Incandenza. Since little's really known about Orin at this point in the story (page 538/981), that Steeply can pass for a woman in Orin's eyes doesn't necessarily count for much, but at the end of the latest Steeply/Marathe promontory chat, we see him looking sad and lamenting about how women can't readily sit in the wild when dressed as he is. Because of the "'possibility of things...crawling up'" (530), you see. Perhaps his being Tiresias is going a bit far, but there's so much room for speculation and interpretation at this point since so much of the book is overdetermined and intentionally overwrought.

The rest of the latest section of the book was just a conversation between Gately and Joelle. But, this conversation hearkens back to an earlier scene in the book, though, thankfully it breaks from the earlier scene in mind since they don't converse in nearly opaque Eubonics. Instead their discussion launches a full frontal assault of dense clause clusters into the reader's brain.

Nonetheless, the important (and completely spoiler rich) thing to derive from this chat is that Joelle is a major reason for "the entertainment"'s effect. Her deformity isn't a lack of anything, but an excess of beauty. So much of an excess in fact, that her visage has the same effect as the p-terminal stimulation that Steeply and Marathe had been discussing earlier: it causes the viewer/subject to forget all other needs except that for the pleasure caused by the visage/stimulation.

So Joelle stars in James O. Incandenza's fifth attempt at Infinite Jest. That is now known. What also's known is that the book's starting to get harder and harder to put down.