I generally take sports journalism with a pinch of salt tbh. Interviews are more dictated by the interviewer than the interviewee in sports. Coaches say their bit to keep up PR responsibilities and then get on with their main jobs. Coaches are nearly always intentionally vague, so as not to give anything internal away. If Lancaster has talked about Burgess more often than other players, it will probably be because interviewers ask after him. Lancaster is full of praise for him, but who in his squad is he not full of praise for? If Lancaster talks about him as a WC possibility, that's not lying; Stephen Donald played a World Cup final because of injuries. I'm sure he'd say that anyone in his squad has a chance. Until a journo says that Lancaster is going to pick Burgess in his 31-man squad, I'm going to assume everything said so far is the normal PR fluff.
I'll make sure to eat my words if I'm wrong about this