http://i45.tinypic.com/347zcbt.jpg
Assuming Umbriel (or is it Umbra?) isn't to large, it appears to have not hit any major cities in Argonia or Morrowind except Alten, Seaspring and Ebonheart. Ebonheart is a pile of rubble now, so it's not like it matters. And even if Alten and Seaspring were pretty big, it wouldn't be a major blow to Argonia.
Both! A Prince is, in a way, His realm. Also, it was apparently only killing the Assimilated.
And the Mage Guild collapsed, replaced with the Synod and the College of Whispers. The Blades seem to be gone, replaced by the Penitus Oculatis (sp). The replacements seem similar to their predecessors, though we don't know much about them yet. Maybe it was only to drive home the fact that we're in a new Era now -- not sure.
Speaking of the Blades, it was nice to see Cloud Ruler mentioned in the book, and Akaviri architecture in general. The agent Colin remembers seeing Cloud Ruler as a child. I wonder who, if anyone, is left there? Elderly caretakers, Talos priests? I hope we find out if the Blades still exist in some form.
I bet they'll come out of the woodwork. Come back when Mede has united Tamriel under his banner.
to be fair, there is tons of small change, its just not shown in games. the wars and border shifts during the imperial simulacrum, for example. or the annexation of elsweyr land to cyrodiil shortly preceding oblivion.
Add to that the games, being massive free-roaming environments, have more space and freedom to deliver background information not essential to the main story than a novel. 'Member what I said thread 1? It does lose a bit at first due to the change in medium, but easily gains it back. Less freedom to explore because the medium is totally story-dependent, but at the same time the only limits are Keyes' imagination and our own.