Here is what will be shown in tonights CTV Trailer for Flashes Before You Eyes.Desmond demands that Locke, Charlie and Hurley go into the jungle to help him find someone. Hurley questions why this is the case. Hurley eventually says 'This guy can tell the future' (paraphrase) in regards to Desmond. The promo alludes to someone else being out in the jungle, possibly the ocean. Desmond ends up hauling a body out of the ocean, it's Claire.
Source: A DarkUFO Informant