According to TG Daily, mobile devices that are now barely lasting for hours could soon be lasting for weeks. The problem is that more of us are using our smartphones as computers vs. phones and this is more of a strain on the battery. At the University of Illinois, they are working on Phsae-change materials (PCM) - a faster but higher-power alternative to flash memory. In PCM memory the power use is 100 times less.
We will believe it when we see it, but we can only hope.