Thought you all might be interested to hear some of the changes coming up in the new edition, some of them directly address odds and ends that I've seen come up.
New Wound Allocation
Basically how this works now is simplified. You shoot your weapons in different sets and the casualties are removed from the closest models by weapon. Basically, the same as now, but more clear from the get-go, and allows the shooting player to have some tactical flexibility.
New Vehicle Damage chart (this is HUGE)
You can now only destroy a vehicle on a penetrating hit if you get SEVEN on the vehicle damage chart. They wanted to cut back on single shots destroying vehicles outright unless it was a more serious dedicated AT weapon. Also, there was commentary in the White Dwarf about how this was intended to make Walkers a bit more valuable. This means that basically, without AP1/AP2/Rending, you are going to have to glance vehicles to death. Huge.
Destroyer Weapon nerf
You get invulnerable saves against D weapons now, with some exceptions (if they roll a 6 on the special "to wound" D weapon table. Again, huge.
Challenge Wounds Spill Over
When you win a challenge, the extra wounds spill over to the squad. Rejoice, Chaos -- your army rule is not just a huge handicap!
Charging into Difficult Terrain
Big change...now it just subtracts 2 inches off of your charge. Fleeting assault units have a bit of a buff here, instead of 3d6-take-the-lowest it's a flat -2.