Difference between Fiori Apps Wave 1 and Wave 2>

Hello everyone,

i have already experience (installation, configuration,...) with fiori apps of wave 1 and the fiori launch page.

Also the SAP Portal Integration with SAPUI5 iView template works fine.

I heared that since fiori wave2> things have changed? So my question:

1) What is the difference (technically) between an fiori app from wav1 and wave2?

2) Is it still possible to integrate the fiori apps from wave2 via SAPUI5 iView template in the SAP Portal?

3) Are the fiori apss from wave2 only accessible via the new fiori launch pad?

Thank you!

BR, René.