A new version of Folio is in active development. Like VectorInk, it uses Kite, which is derived from Odyssey and offers specific Webkit features that, which some might find surprising, are actually not available in newer versions.
If a new version of Kite can be build based on Wayfarer, that would certainly be very interesting. That said, the older Webkit offers plenty of capabilities for my needs and there is a noticable (albeit not drastic) performance advantage.
(If Wayfarer were to get hardware acceleration for graphics, which I am not sure is feasible, I suspect it could actually feel much faster than Odyssey.)