True lol
Unfortunately, I know that feeling, and I'm sure Turnro could make the campaign playable on some older patches. But the gameplay could be a bit different due to the models of characters being replaced by the older ones, since not every character models could fit in the older patches. Not only that, but the icons of some spells, items, units, buildings etc may be replaced as well. That means some of a campaign design would be different, but the mechanics would remain the same. Overall, I think that's a huge project that has to be taken into consideration before thinking about downgrading the entire campaign. But, of course, that's not something that couldn't be done.
Yeah okay. It'll be interesting to see what Turnro says about this when the time comes.
I actually think someone was able to do this with one of Tomoraiders campaigns. That's not supposed to be playable unless you have 1.30, but there's a file of it that works for 1.27. Now I'm not sure when that was done, or what conditions they were under, but as you and Tomikqx said, this campaign (Malfs Quest) might be quite advanced. The other option is those 1.31 backup files that I saw on hive some time ago, but it looks quite complex to download, so I probably wouldn't do that unless as a last resort
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Anyway here are some of my predictions, based on what I've see/heard, plus a few of my own.
Some of these will be quite unlikely, but here goes
Cries of the Aspects
Ally with the Dragon Aspects
Not sure of the location this map will take place in, possibly somewhere in Ashenvale (this chapter was previously called Giants of Ashenvale)
Red and Bronze Dragonflights are fighting the legion. Illidan and the Highborne are also here. Illidan is trying to gain the allegiance of Alexstrasza.
He runs into Malfurion, and the two square off in a duel, Tyrande shows up with Alexstrasza and helps Furion win. Alexstrasza tells Illidan he is serving a dark power and he retreats. Noticing he has Naga with him, Furion has the option to pursue some of them (Realm of the Tides).
While on the way to Nozdormu, Furion senses another fountain of power. He goes to destroy it, but Magtheridon appears, and serves as the boss battle for this chapter. Furion then somehow ends up in the Nightmare. Also maybe he never makes it to Nozdormu.
Dangerous Crossroads
Tyrande asks Cenarius and Medivh what to do, and takes part in the ritual that Medivh did in the Highborne campaign. Also may involve Illidan and Kath'ranis (this interlude was originally called Sorrows of the Quel'dorei). Mother Shahraz comes to negotiate with Illidan, but Illidan kills her instead. Azshara then reveals herself, and Illidan and Kath'ranis realize they have been working for her all along.
Eternal Nightmare
Have done plenty of speculating on this one, but is obviously Tyrande going to search for Malfurion, and Ysera in the Nightmare. That will probably be at the end of the chapter, but since we spend the entire chapter in the Nightmare, we could see a whole bunch of other things Nightmare related. Eredon and Xavius (okay now I'm certain he will show up), are the final bosses. Additionally Kil'Jaeden might send a demon to check on Eredon to see if he's preforming his task, possibly Anetheron, and Tyrande fights him on the way to saving Furion.
Final Conflicts
Furion and Tyrande realize they made need Illidan's help in combatting the demons. The Legion is attacking the main Naga/Highborne encampment and Furion and Tyrande find a downtrodden Illidan, realizing he's been tricked. Then teams up with Furion and Tyrande. Jaraxxus is the boss battle of this chapter as he killed Velinde earlier (not sure if that's still going to happen), and now Illidan has killed Shahraz so Jaraxxus will want vengeance. Or maybe before the boss battle Malfurion suddenly gets transported away somewhere and it's just Illidan and Tyrande fighting Jaraxxus. Malfurion gets trasnported to the Caverns of Time, where Nozdormu is distrustful of him. A boss battle with Nozdormu happens, but is interrupted when a demon strikeforce enters the Caverns led by Mephistroth. Furion then defeats Mephistroth and earns Nozdormu's trust.
Just a few ideas, some of them are pretty out there, but to be taken with a grain of salt