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Before you update
The supplied 1.0 FAQ material says existing saves carry over. Even so, keep a backup before a major patch, update mods only after their authors confirm compatibility, and read the current patch notes before changing a long-running save.
What changed
The provided 1.0 discussion highlights relationship and marriage-related changes, achievements, and player-choice options. Read the official update FAQ for the complete feature list and exact conditions instead of relying on second-hand summaries.
Sources
Condensed from the supplied 1.0 FAQ discussion and official update extracts. Patch notes are the source of truth when details conflict.