Let's hope they don't go crazy with the thinness (which from what I gather Ive is pretty big on) because if they put a 2500+ mAh battery that's going to lead to some serious battery life improvements.
If the current iPhone can go almost toe to toe with devices that use a 3000 mAh battery despite it's 1520 mAh battery, then putting in a battery with another 1000 mAh is going to force everyone else to step up their game on the batterylife front. So it's a win-win kind of thing as even people who don't use iPhones will see their device makers producing devices that last for more than a day or two between recharges.
If the current iPhone can go almost toe to toe with devices that use a 3000 mAh battery despite it's 1520 mAh battery, then putting in a battery with another 1000 mAh is going to force everyone else to step up their game on the batterylife front. So it's a win-win kind of thing as even people who don't use iPhones will see their device makers producing devices that last for more than a day or two between recharges.