What features will I lose if I don't upgrade my 30dc free trial to Bronze?

The sales page for the 30dc discount special says that if I don't upgrade from my free trial offer, some features will be disabled. What are those?

• 30DC
• features
• upgrade

UPGRADING QUESTIONS

THINKING ABOUT UPGRADING WITH SPECIAL 30DC OFFER. WOULD LIKE YOU TO EXPLAIN DIFFERENCE BETWEEN PREMIUM PLUGINS AND THE ORDINARY PLUGINS OFFERED ON SAY 'BRONZE'. THANK YOU SO MUCH FOR WORDPRESS AS THEY SAY IN 30DC 'IT'S AWESOME'

• DIFFERENCE BETWEEN PLUGINS
• upgrade

Can I upgrade to the latest version of WordPress?

Do I have to do this all manually, or do you provide an easier way?

• upgrade
• wordpress version