I haven't watched any of this series, but it seems like Digimon or Applimon fuse together to become stronger. I never liked the non-stop fusing aspect of XW, since it seemed lazy and kind of felt like a cheap victory, what with them picking Xrossing together, instead of training and character growth. Also, I hated that the main character's friends got Digivices and Digimon in the last freaking episode!
I don't mind it when Digimon fuse once or twice, but using it over and over to get stronger just rubs me the wrong way. 02, IMO, did the fusing together thing right, since it only happened once per Digimon.
So anyway, should I be worried or will the Apps start evolving eventually?