I talked to Andy yesterday about his DJ tour. I asked (of course) about the box. Paraphrasing here-

There isn't that much unreleased that features vocals
Plenty of different takes/instrumentation of songs we all know (nothing new here if you read Goddard's book)
Rourke/Marr/Joyce all want it to come out. Morrissey wants little to do with something that also includes Joyce.

The radio station 'Real Radio' broadcasting in yorkshire, Scotland and Wales are doing a transmission on Saturday 12th July from around 1pm hosted by scouse comic Alexei Sayle, The main content is focused on The Smiths- how and why they split and the 'Real' truth surrounding the royalties issue. Should be a good one!