My understanding is that this release is to fix the WiFi problems that were seen in 4.10.11591. It will probably just go to the same devices in the same order. I do not expect there to be any changes beyond what was in the previous release. My notes from the previous release are
here.
For calibre users, this will already be supported by calibre v3.30.
Edit:
Checked with Kobo, and this will be for devices "that we currently sell". So, the Aura ONE and later. They don't seem to have configured the Aura ONE deployment yet, but I think it is more important for the others (adding Overdrive and then fixing the WiFi). And it is only to fix the WiFi issues.
There will be an update for the older devices "soon".