Yes, all "modern" bid books & applicant files are bilingual French & English, the 2 official languages of the IOC.
Some applicant files and also bid books (but mostly in pdf) are also bilingual English + the language of the country ! (Spain, Turkey, Brazil, ...)
Regarding the promotional brochures, it depends.... you will find some bilingual english/french when used at some official IOC functions, some others in the sole language of the bidding country, some others in some of the main languages of the IOC members (English, French, Spanish, Arabic, ....) and finally some various on the language were some promotional operations were realized (I have for example some Rio 2016 bid brochures in German, when they were doing promotional actions during the 2009 IAAF World Champs !)