It has to pass review by the Postal Regulatory Commission, but yes, from the filing they will end the entire Bound Printed Matter category, specifically to end its use for books, under the previous BPM Flats and BPM Parcels (which is what we on Amazon use, under their license) categories to ship books.

The filing by the USPS (docket # MC2025-948, if you want to look it up - I can't post an outside link here) does note that, yes, books could and can be sent BPM, at least until the changes are approved and take effect sometime after July, 2025.

The non-book material (catalogs, phone books, etc) that can currently be sent under BPM will have to be sent under Marketing Mail rate, whose max weights they want to increase. Books can not be sent as Marketing Mail because that category excludes items that are sent as order fulfillment.

Books will have to be sent as either Media Rate Mail or other rates such as Ground Advantage.

The end-of-BPM change will also be contingent on the heavier weights being approved

There has been a continuing debate on bookselling sites as to whether books can be sent BPM rate (it's right up there with whether you can list books as "New" by condition, or by status from a wholesaler, in popularity). The filing notes that, yes, books can be sent BPM currently. Originally, the rate (then known as 4th Class rate for those who remember) required advertising in anything sent under the rate, so book publisers started including advertising in their smaller paperbacks (remember those cardboard inserts in the middle of vintage paperbacks that had ads for cigarettes and book clubs?).

As the filing says, "Book publishers thus increasingly added advertising to their books to the extent they found it advantageous to pay zoned BPM rates rather than unzoned “book” rates (special-rate fourth-class mail, now Media / Library Mail), until, in 1991, the Postal Rate Commission removed this restriction as well. Its rationale for doing so was that “[i]t does not make economic sense to require publishers to include advertising in their books in order to qualify for these [BPM] rates.” Docket No. R90-1, Postal Rate Commission opinion, vol. 1, Jan. 4, 1991, at V- 375-76. From 1991 until today, then, commercial book sellers and mailers have had the option to mail books either as Bound Printed Matter or as Media / Library Mail (or using one of the competitive package products)."

So, if the USPS request passes the Commission, and if the increased weights for Marketing Mail pass, BPM will end sometime after July. You can contact your congressman to weigh in on this, and that it will represent a disadvantage to you as a small business owner, which the filing notes as a possible objection.

Amazon itself has some lobbyists, I would guess (hint, hint), so this might be a good thing for them to contact congress about on behalf of its 3rd-party sellers and its own book sales.

This would also be likely to raise the prices for book returns and book disposals by return to seller.