I too doubt that the battery capacities will increase. But, why would you want the battery to be smaller? Sure it charges faster, but all that does is display a higher percentage in the status bar vs actually having more charge. All phones start to very very slowly trickle charge at like 90% but charge like crazy before they get to that point. A larger capacity battery charging from zero will not reach 100% before a smaller capacity battery, but it will be charging at a higher rate while the smaller capacity battery is trickle charging after 90%. Let's say you had 2 batteries, 1000 mAh and 3000 mAh, both can charge on a 2A charger, and both trickle charge at 500mA when at 90%. The smaller battery will take 39 minutes to fully charge(27 minutes to 90% and 12 minutes to 100% at trickle charge rate). The larger battery won't reach trickle state during that time, but will amass 1300mAh of charge in the same 39 minutes (30% more charge); taking 117 minutes to fully charge. Even though the percentage would be 43% it would still have more charge than the smaller capacity battery. I know this math takes certain assumptions into account (like the constant rate of charge), but I feel the logic is sound. I don't feel there is any reason to want a smaller battery in the phone just so it can charge faster. Plus, when the batteries start to degrade I'll bet 80% health on the larger battery won't look as bad as 80% on the smaller one.