No. Redmi Y2 can support only one sim card on 4G network at a time. Another sim card will be either on 2G or 3G network.
No. None of the Xiaomi phones comes with the earphone. You have to purchase it separately.
Yes, Redmi Y2 can support split screen.
Yes, Redmi Y2 does support the PUBG game.
Yes, Redmi Y2 does have the support for Miracast.
The Xiaomi Redmi Y2 is a slightly better attempt at a selfie-focused smartphone than the model it replaces. It has proven hardware that is capable of delivering a smooth user experience, plus MIUI 9.5 which has a lot of added features.