Why are you so interested in controlling other people's ideas and reactions though? If someone's gut instinct is to say, this sucks and I hope they don't do it like this. Why shouldn't they be able to say it? Alot of people in here (myself not included) think that the psychic changes could be bad because they have experience with fantasy. I don't and the changes to the psychic stuff sound interesting and possibly cool. But for all I know it's going to blow chucks. Your exaggeration of people's reaction is silly. I think alot of us know that gws is not the best at rules and gameplay, so we are just hoping that they improve instead of making something worse. It's the great models and the cool lore that make us stay (that and the fact that everyone plays 40k so it's hard to play anything else).
I'm not looking to control anyone. Heck, I WANT people to have ideas and opinions (or else we'd all be the same...and I really don't want a world of people who all play the same army the same way all the time) I'm just saying that we look more like a group of well reasoned adults when we don't jump to conclusions before all the facts are in. Yes the actual rules CAN be bad, but more often than not the general reaction is considerably overblown, especially in light of how the full rules work (the rumored Ward Staves, the Necron Character who was rumored to hit all models in a unit that were the same with shooting attacks, and the possibility that Necrons were going to get FnP instead of Resurrection Protocols come to mind as a few examples of things I've seen get blown out of proportion on incomplete, incorrect or partial rumors). I just recommend salt and not jumping to conclusions. If you want to that's fine, but I'm still going to advocate salt, and waiting for the full ruleset before jumping to conclusions.
Let's look at the rumors for the psychic powers for a moment: what we know is that there is a deck of cards and unconfirmed rules saying their will be some common powers. But what the reactions are saying is that we're hinging the sucess on an entire edition on the mechanic that we know next to nothing about for this edition. That's a lot to weigh in on this one peice of a puzzle.
And considering that this isn't the only forum I look at (I regularly check Warseer, DakkaDakka along with several blog sites and running Google searches for new tidbits) I can say that my perception of the reactions isn't that far off. I've seen more anger, whining and general bile in reaction to just about anything than is probably good for anyone to have to look at. To say the internet tends to be a machine that generates its own drama often for no reason really isn't that out of line from my viewpoint at least.
What I prefer to bitch about is adding of more random unpredictable effects. Particularly random charging distances and random terrain. If you are within 30 feet of your target, you should be able to accurately predict how long it will take to move up to them. Running isn't a chaotic procedure, and people should be able to run in a normal way without sometimes only running 5 feet and sometimes 30 feet.
I can see where you're coming from, but you're getting mad about a rumor that doesn't encapsulate the full Assault Phase. For all we know there'll be other rules that come into effect with this, or this could be more specific than we currently know.
And out in the open on flat ground, sure running isn't a problem and you should be able to cover ground easilly but on uneven terrain (or fields with gopher holes) or through craters, or over deep gravel I can say from experiance that you won't always be able to run as fast since the terrain could easilly cause a wide variety of injuries, or trip you up.
Another way to look at the run move is that the models started running in the movement phase, and then slow down/stop in the shooting phase. Enviromental conditions would still apply of course, but it at least makes more sense than saying your models sprinted a meter.
As for mysterious terrain, I think they should add a mission where there is mysterious terrain. call the mission death world and in that place all the terrain has bizarre effects. I don't want mysterious terrain in every game because it doesn't make sense. If i'm playing in a ruined city, I want the buildings to be reliably predictable. If I walk into it, it will be a ruined building inside and movement is slightly impeded. No tentacles leaping out of walls or poisonous indigenous life forms killing space marines that are in power armor or whatever.
The easiest way to fix the terrain thing is to ignore it if it turns out to be useless/broken. At my FLGS that's been the policy for the 8th edition magical terrain rules. The only exception is occasionally there is a peice or two added to a board for tournament games.
Perhaps if they had levels of mysterious terrain, like, "You find ammo inside the building." That wouldn't be so bad I guess. But if it's like, "Oh shit there's a fucking bomb inside the building and it blows up your shit!" that will be frustrating. Maybe if they had 1 of the 6 missions be 'mysterious terrain' and there was mysterious stuff in each different kind of terrain. something for forrest and something for ruins.
That could be interesting. Depending on what they have that might be worth developing into a homebrew mission.