There are a number of material and technology advances [1] that accelerated the pace of the Sagrada Familia's construction — the techniques used to construct the basilica have evolved significantly since construction began.
There are a few workarounds that don't involve undocumented APIs for this, as someone else in this thread mentioned.
Facebook's Groups app uses (disclaimer: as far as I can tell) an interesting technique involving saving data URIs to the home screen and then deep linking them.
A long press is a function of time:
"How long has the user pressed?"
3D Touch is a function of pressure:
"How hard has the user pressed?"
In practice, things that your application previously accomplished with long presses may be more suitably accomplished with 3D Touch — things like contextual menus or shortcuts come to mind. Additionally, iOS has new APIs for presenting content using 3D Touch. The article briefly references them.
It appears that a Chinese company named Kunlun licensed IP from Rovio and is developing Angry Birds apps specifically for the Chinese market. Perhaps they're also distributing the app themselves.