They mention remastering the old Ytsejam official bootlegs, and giving them new cover art. So...that shows they have some kind of specific idea which would mean it is some kind of priority.
They mention reissuing, not remastering.
No, they mentioned both. From a little ways up:
[snip]
Oh.
Well, that's very good.
I wonder if this means we'll get better quality copies of the FII demos; I always found the low frequencies really overpowering on that release. It would be great to have a version more akin to how some of these demos sounded on Cleaning Out the Closet (or the Hollow Years single, in the case of You Or Me, or the Japanese FII bonus disc for Take Away My Pain).
Regarding Astonishing:
An audio-only release would be quite nice, but it would be GREAT if they could get some audience video and use the tour visuals to make a full version of the Astonishing Live, from various shows. I've certainly seen audience video of the tour go around; I'm aware of a decent chunk of the first London show existing on video.
If the band reached out to fans to share video with them, maybe they would get enough footage to use.
Failing that, as Weymolith notes, the screen videos would also work.
Another potentially fun prospect would be for DT to do a one-off Astonishing show in New York before their next album releases. Film it, and use that.
It would be a big undertaking, and I'm probably kidding myself by even suggesting the possibility of this, but it's a fun thought at least.