You know what's funny?
Pit's down-B is now a bidirectional projectile-reflector that he recovers fairly quickly from. If they gave it the property to push back characters that are too close to Pit, which is a reasonably sensible way to deal with that situation ... then they just gave a Pit a shine. And it would tickle me to no end if that was the case.
Whence do you know that Pit's down-b is now a bidrectional projectile-reflector? It would be worse than Fox Reflector. Sakurai had create the power / effect '' Reflector '', but he gave Pit the guardian orbitars.
And I think the guardian shields will disappear, if you use it to long or if it gets to much damage by an attack. The guardian orbitars just replaced the mirrorshield... withhout mirroreffect, but Pit is protected from both sides.
Pits weakness if he uses guardian orbitars is for example Megamans down rocket. ( I don't know if its down B or A ). Or Link could throw a bomb between the shields, after his jump. ( He doesn't have to be above from Pit. Its enough if he throws his Bomb further away )
Besides you can use airdodge to pass the shield. ^^ Maybe Toon-Link could use his down A to attack Pit, after his airdodge.
But I think Pit is going to get the 3 sacred treasures as Finalsmash, because the mirrorshield is one of the most important weapons in Kid Icarus ( we know he defeated Medusa every time with the 3 sacred treasures ). The Mirrorshield is one of the 3 sacred treasures and maybe he can reflect and blocks the projectiles / attacks. ^^
I just speculate, but maybe it will comes so.