Been a manager's tools subscriber for almost 5 years and followed their advice during recent interviewing process.

Received an email that I was selected candidate for a role w/a company interviewing.  No details on actual offer.  I've been invited to attend a Job Offer Presentation with HR and hiring manager.

This is the first time in my 20 years working where I've encountered a Job Offer Presentation.  

Anyone familiar with this process and tips on what to expect?