What is happening is that Gollancz is releasing completely new and revised p-book editions of his works.
Hopefully the Gateway ebook editions will be produced from the pbook editions, which should make the proofing better.
Here's the original announcement:
[I]Gollancz has announced a major two-year publishing project to release the entire science fiction and fantasy back catalogue of Michael Moorcock in both print and eBook editions, as well as a substantial amount of his literary fiction.
Starting in February 2013, the programme will bring back all of Moorcock’s genre works including Hawkmoon, Corum, Von Bek, the Eternal Champion books and, of course, his most famous creation, Elric. At the same time Gollancz will also publish Moorcock’s Jerry Cornelius novels, The Brothel in Rosenstrasse and other non-genre fiction.
The newly published books are definitive editions, carefully prepared with the author and his long-standing friend, bibliographer and editor, John Davey. The new versions will be particularly important to fans as they will present the Elric stories in a consistent internal chronological order together with associational material never previously published.
The books will be published by Gollancz as print omnibus editions with a matching livery. Individual eBooks will be published by SF Gateway, Gollancz’s ground-breaking online SF&F digital library of classic genre fiction. The programme begins with the publication of the last three Elric novels: Daughter of Dreams, Destiny’s Brother and Son of the Wolf.
“I am extremely pleased to be continuing a relationship with Victor Gollancz which began nearly fifty years ago,” said Moorcock. “This new programme will make available many of my books which have been hard to obtain in any form and will now be available in both print and electronic form in newly revised definitive editions prepared by myself and my long-standing friend and editor John Davey.”