Actually not really sure how this is going to be huge. The reason the plus models have bigger batteries is because they drive bigger displays. Yes the Plus has longer battery life, but not revolutionary.
When you are putting a larger screen than the Plus on a chassis the size of the 4.7" phone, you NEED to find a way to put in a bigger battery just to maintain current battery life levels.
I wouldn't expect too much from this actually. Same goes for the RAM. Of course there will be 3G, the pixels that need to be driven are the same or greater than the current Plus model which was deemed to require that amount by Apple.