Panels 2.1 brings OPDS support. That means, apart from supporting Ubooquity, Panels now supports other media servers like Komga or Calibre.
Panels 2.1 also includes new Reading Now section: “Next Up”, which shows the next comic to read in the collection you are reading.
Panels 2.1 is currently available for beta testers and will be available in the store (hopefully) by the end of the week.
PS: Give some kudos to @dani because he basically implemented the whole thing
PS2: Panels still does not support streaming, Panels uses OPDS servers to browse and import comics easily.