I'm not going to bore you with camera choices - but I did buy a video camera especially for this trip.
Don't know how to use it properly or how to edit the results, but it would not be good to visit gorillas without at least getting some moving pictures.
Will take stills with my SLR - taken a lot of memory, and hoping to get the battery charged easily enough in hotels/bandas.
Got a cool little tripod? that attaches to an open car window - for those long lens shots on safari. Also taking a full tripod to get over the shakes.