Bigg Boss Season 4 might not be happening this year as the situation is unfavorable to plan a show where celebrities have to stay in a house for 3-4 months. Even though the demand for show will be high and Nagarjuna could return as a host, the social distancing norms, violations could prove to be too much to handle. They cannot have new entries or wild card contestants as freely as they like. Also, to execute such a production they need lot of support staff and crew too.
As these all prove to be very complicated issues to handle for a producer, they hope to try and return next year when things might be less serious. Also, everyone need vaccination or perfect cure going forward to feel safe. Keeping all this in mind, the producers have decided to review the situation post July and take a decision but for now, they are not inclined to have a season 4, this year, it seems.