Two new Windows 10 for Phones features that at least I was not aware of yet. Surprisingly these two features are listed in the official "How to use Windows 10 Technical Preview for phones" page.
So, if you have a Windows Phone device with screen size of 5-inch or more you
For activating swipe to home, you need to go to Settings---->Apps----> Switch on "Swipe to Home" toggle. This works fine with all native apps and can work with some 3rd party apps as well.
You can learn how to install WhatsApp, Instagram & other apps from 3rd party stores on Nokia