From OFP.info

Ebud has informed about the release of his long waited Tonal update Tonal Redux on the BI forums.

Tonal Redux is a set of addons that transform OFP into an African Bushwar. This update replaces the Tonal Island jungle setting with a new dry grassland and bush setting. Most all units and vehicles have been updated or replaced as well as most all plant life and many urban and rural structures. I have intentionally stayed away from posting pics as I wanted people to see the updates in-game as they play rather than in pics. No hype. Just download this once the links become ready and try it out. Read the readme before asking questions on installation and compatibility with other mods/addons.
Remember the island that Ballistic Addon Studios made back in 2003? It's back with a new bush theme and still I think this is the best island made for Operation Flashpoint. This should keep us occupied until Armed Assault.

BIS Forum Thread here w/ download links.