i think most of them will not participate afraid about the penalties
about the professional boxing in rio
IBF in fight vs AIBA /IOC , many penalities against the professional boxers who will participate in rio
Essentially, an IBF Champion or fighter included in the IBF ratings that chooses to participate in the 2016 Olympic Games in Rio will be found in violation of rule 5. Their participation in these games will be considered unsportsmanlike behavior due to the potential risks involved with amateur boxers competing against professional boxers. An IBF Champion found in violation of rule 5 will have the title vacated and will be removed from the ratings for one year, and an IBF rated fighter will be removed from the ratings for one year.
here