"Will have" refers to an event in the future that precedes some other event in the future. "By the time the police arrive, I will have hidden the evidence." At some point in the future the police will arrive. Before that time, but still after the present time, I will hide the evidence.
"Would have" refers to a past hypothetical. It is used when you want to say that an event didn't happen, but that in some alternate universe where conditions where different, it did happen. (Okay, that's an odd wording, but I'm struggling how to express the idea without using the words "would have". To say, "would have" refers to something that would have happened ..." probably doesn't help. :-) Like, "If Sally had passed the test, she would have gotten the job." Sally didn't pass the test and didn't get the job, but if she had passed the test, then she would have gotten the job. "Jack would have won a fair contest." Jack lost the contest, but if it had been fair, he would have won. (Or perhaps there never was any contest, but if there had been a fair one, he would have won. Depends on context.) The condition doesn't necessarily have to be spelled out in a simple IF/THEN construct. You could say, "Mr Smith died before I was born. I would have liked to have known such a man." In this case the condition is clear from the context: if our life-spans had overlapped. It could certainly be more subtle.
I'm struggling to think of any other use of "would have". If another poster here thinks of one, please feel free to shout it out.
You could not use "would have" instead of "will have" in the above paragraph, because (a) there is no condition on Jack selecting the living quarters, and (b) even if there was, "would have" is used for past events, not future events.
To my ear, the PEU examples are both colloquially natural and accurately described, while the Macmillan examples, although colloquial, are somewhat misleadingly described: things that are happening now might be better expressed as things that have just happened or have just been reported. But that's a minor criticism.
All these examples exhibit the same basic use of will to express habitual or characteristic action. In this sense (like all the modals in all their senses) this habitual will employs its tensed forms, and particularly the past-tense form, to express nuances which may have little or nothing to do with tense. Speaking very broadly,
Ordinary unstressed uses usually express simple habit—behavior repeated frequently over a long period of time—and tense has its usual significance of present or past reference:
When he's preoccupied with a problem he will often pace up and down for hours.
When I was a child we would always go to my grandmother's for Thanksgiving dinner.
When will or would is stressed, the sense is somewhat different: the habitual action is represented as perversely deliberate. And the tenses are employed somwhat differently, too. The present-tense form generally signifies that the subject currently makes a habit of the perverse behavior:
She will keep falling in love with the wrong people is rhetorically equivalent to She insists on falling in love with the wrong people.
But the past-tense form, although refers to a past action, does not express repeated action in the past but represents the subject's behavior on a single occasion as characteristically perverse:
You would tell Mary about the party ... Even though I asked you not to tell anybody without checking with me, you just can't control yourself around her.
A: He said it was all Jack's fault.
B: Well, he would say that, wouldn't he. Nothing is ever his fault, oh no!
Best Answer
'Will' can be used in each of those examples, but it has a different meaning than 'would'.
'Will' means that the action is going to happen, regardless of it being a mistake (in example 1), or unwanted by the speaker (in example 2) or just because that's what is going to happen (example 3), whereas 'would' suggests that there is a choice, and as things are currently planned, they won't happen (example 3 and perhaps 2), or as things may be planned by someone, they will, but the speaker hopes they will not happen (example 1, and perhaps example 2).