The batteries are not interchangeable unfortunately(E1505 has a step down right at the top of the battery, so the I6000 battery won't fit). The AC adapters are slightly different but they both work. The only change is the E1505 adapter is a 2 prong instead of a 3 prong plug, but the actual power brick is the same wattage and everything.
The E1505 is noticably thinner when you pick one up then the other. It may only be about .1" thinner, but it feels like more when you pick it up. The screen, when closed, also doesn't have that annoying gap that Chevyrulz was talking about. My I6000D had more gap on the right side than the left and had way too much room to be pushed down. The E1505 sits almost completely tight against the base, maybe a mm of a gap between the bumper and the base, and it's completely even. The E1505 is also lighter. Not sure by how much, but again, it's noticable. I have noticed that it gets a little warmer than my I6000D did though, but it's still not bad enough to be uncomfortable. Hopefully that will get better with some AS5.
Overall most of the changes to the E1505 are small, but they all add up to a nice difference. The E1505 also has better fit and finish than my I6000D did, which is nice.
I'm going to write a full review on it in a week or two once I've had a chance to really check out every aspect of the E1505. I will compare it to the I6000D so everyone can see how much of a change there really is.