The new protagonists look fine, but I'm never picky about aesthetics. I have doubts about the rival having a unique story, though.
There is of course a chance that new characters will fulfill the prophecy, but aside from the gender issue and the general distastefulness (what makes them more special than their predecessors?), there is another problem: Wouldn't it be awkward for the player character to get crowned? Since Red and Green we've played as characters who saved the day in some way and defeated every trainer out there, and yet nothing grandiose happened to those characters, presumably so that we would still be able to relate to them. It's hard to imagine playing as a character who would actually become the king of Unova, especially as we've never even played the role of a Champion despite having that potential.
Perhaps neither Reshiram nor Zekrom will be catchable in B2W2, and both will be dormant in the beginning due to Kyurem absorbing their energy. By defeating Black/White Kyurem only one of the dragons will be restored (the one belonging to Hilbert/Hilda). Kyurem, locked to just one of its Formes, will join N, but there will still be a problem - restoring N's dragon without depriving Kyurem of its remaining energy. This is where the player will come in, and after they successfully find a way to bring N's dragon back without hurting Kyurem, N will be reunited with his dragon and will thank the player by releasing Black/White Kyurem. At this point N will give a collective name to the Tao trio (referred to as beings in the prophecy).
There is of course a chance that new characters will fulfill the prophecy, but aside from the gender issue and the general distastefulness (what makes them more special than their predecessors?), there is another problem: Wouldn't it be awkward for the player character to get crowned? Since Red and Green we've played as characters who saved the day in some way and defeated every trainer out there, and yet nothing grandiose happened to those characters, presumably so that we would still be able to relate to them. It's hard to imagine playing as a character who would actually become the king of Unova, especially as we've never even played the role of a Champion despite having that potential.
Perhaps neither Reshiram nor Zekrom will be catchable in B2W2, and both will be dormant in the beginning due to Kyurem absorbing their energy. By defeating Black/White Kyurem only one of the dragons will be restored (the one belonging to Hilbert/Hilda). Kyurem, locked to just one of its Formes, will join N, but there will still be a problem - restoring N's dragon without depriving Kyurem of its remaining energy. This is where the player will come in, and after they successfully find a way to bring N's dragon back without hurting Kyurem, N will be reunited with his dragon and will thank the player by releasing Black/White Kyurem. At this point N will give a collective name to the Tao trio (referred to as beings in the prophecy).