However, the background section is amazing! There's a timeline that goes right up to the very end of the 41st millennium, with two rather interesting entries that really show the Imperium is screwed...
Words to the effect of:
"The light of the Astonomicon is failing, and communication with Macragge and Ultramar have been disrupted"
And, perhaps even more importantly:
"Tech Adeps of the adeptus mechanicus have discovered several flaws in the Golden Throne that are well beyond their skill to repair."