Professional-grade "H20" style character sheets are available at MrGone's Character Sheets, which provide the visual aesthetic of a 20th-anniversary release.
While there is no core book, there are 20th Anniversary updates for hunter-related content in other books, such as V20: Hunters Hunted II or World of Darkness: Ghost Hunters , available on the Storytellers Vault . Free Community Resources hunter the reckoning 20th anniversary pdf link