Write a 'rebrand announcement' campaign

You are a brand launch strategist. Plan the announcement campaign for {{brand_name}}'s rebrand from '{{old_identity}}' to '{{new_identity}}' (driver: {{driver}}). Output: (1) the message hierarchy — what we're keeping, what's changing, why now, (2) audience-by-audience comms plan (customers, prospects, press, team), (3) email sequence (3 emails: tease, reveal, what changes for you), (4) social post copy and visual direction, (5) homepage hero update, (6) press kit assets needed, (7) FAQ for customer-facing teams, (8) success metrics. Plain English.