I've already said a new master was created, that's not in dispute. I'm not even arguing about the technical definition of remaster. But U2 isn't calling it "remastered". That should be what governs here.
I'll repost what I did before for those who are still confused by the issue:
You could say that any time you've made an alteration to the original recording and created a new master it's a "remaster." And that's certainly happened here. It's definitely not the same record we already have. It will certainly be louder, and, according to Edge, the've "polished" it, which likely means some tweaking on some of the other levels. This is more akin to what was done for the compilation releases, and what some of us suspected and said they'd do all along. It really was never likely they'd reissue the album without doing something to it along these lines, to make the levels more in line w/contemporary releases. But as others have accurately said, any such adjustments would be limited to the dynamic range of the existing master recording (though, without getting technical, professional equipment can tweak this to a certain extent).
Incidentally, those who say this is something similar to what you could do at home are essentially correct. If you take a existing digital audio Achtung Baby song file on your computer, adjust the levels, and create a new file from that, you've essentially created a new "master." As others have correctly pointed out, people on U2 bootleg sites do this all the time. U2's essentially doing the same here, albeit with professional equipment and engineers.
On the other hand, Achtung Baby has certainly not been "remastered" in the way that the previous reissues were, so much so that U2 is not calling it a remaster. A true remaster would involve going back to the sources tapes (whether they're analogue or digital), and from those individual recordings creating a new "final" sound and "master" for the record. Sometimes this process can even result in a completely new sounding "mix" of the song, though not necessarily. They also may clean up tape hiss, errant noises heard in the studio, etc. This is what was done for the previous remasters, but U2 apparently didn't think all this was necessary in the case of Achtung Baby.
The original press releases, and associated materials, for all the other reissues described this process of going back to the original source tapes. Here's an example from the Joshua Tree, but the info for all the releases is easily found on Google:
This is a much more extensive process than simply "re-EQ'ng" the existing, finished recording, which is what apparently U2 did here. And clearly a true remaster going back to the source tapes is not something you can do at home.
So really, everyone should have a reason to be happy with this, because AB as it existed sounded great and apparently represented the original intent of the artist, so they've just cleaned it up a bit without compromising the original sound. As long as what they did didn't result in over compression, etc....it should sound "better", and it will certainly sound different to some extent (your mileage may vary depending on your equipment, what format you're listening in, how familiar you are with the original, and most importantly, your ears). It should definitely sound noticeably louder, and careful listeners may hear increased clarity and depending on what they did, along with other sonic "improvements."
Whether it can be called "remastered" or not at this point is really a question of semantics...though the band certainly doesn't consider it "remastered", at least in the way the previous ones were, so if their opinion about their own record means anything to you, there's your answer.
The opinion of U2 regarding their own record? Mate, if they consider HTDAAB a great record... do you really thing i'd consider their word regarding technical stuff like remastering?