"Brothers & Sisters" would most likely not be reissued this year because it was the subject of a big reissue back in 2013, including a 4-disc box set. The same cannot be said however for other ABB albums like their first self-titled album, "Eat a Peach", or any of their albums following "Brothers & Sisters", so it will be interesting to see which album they select next for this super-deluxe reissue series. (My money would most likely be on the first album or "Eat a Peach").
But I completely agree with you in that I find this album to be so much better than both the Fillmore East live album and "Eat a Peach", both in terms of content and surround mix. I can only hope that they continue to use Kevin Reeves for any other ABB surround mixes they embark on in the future.