Smarter software is the thing
My Samsung Note 3 (already superceded by the Note 4) is by far the best smartphone I've owned, primarily for the size of its display--why get a tablet when you have a "phablet"?--and monster battery.
In fact, my wishlist for 2015 has more to do with smart software, not hardware. For instance, wouldn't it be cool if the phone came to notice that you always launch the browser and go to CNN when you enter the Starbucks? It should start making this app choice/URL choice for you. Likewise, the phone should automatically cast your current radio station to your Wifi-connected speakers when you enter the house. Seamless automation like that will make smartphones--already the most intimate of our consumer electronics devices--even more magical and essential.