CNN with an early look at what to expect in Zelensky's speech https://edition.cnn.com/europe/live-news/russia-ukraine-war-news-12-21-22/h_d9706c8f4cdc7a4e15a637ca1df58250
So putting my guessing hat on; it'll cover:
* Radiation/nuclear safety
* Indefinite extension of Grain Deal
* Price restrictions on Russian energy
* Release of prisoners and deportees -- POWs; forcible deportees; children
* Restoration of Ukrainian territorial integrity
* Withdrawal of Russian forces
* Reparations for damages to be paid by Russia
* Funding and technology to restore damaged infrastructure and offset environmental damage
* Effective security guarantees (the Kyiv Security Compact)
