Let's have a look at just how many first party games have been pushed back on the system...
- Pikmin 3
- The Wonderful 101 (Not Nintendo developed, but Nintendo published)
- Wii Party U
- Wii Fit U
- Donkey Kong Country Tropical Freeze
- Xenoblade Chronicles X
- Captain Toad: Treasure Tracker (In PAL)
- Kirby and the Rainbow Curse (In PAL)
- Zelda
This recent Zelda delay is not a freak occurence, it is the norm for Nintendo on Wii U.