USA Bands For T-Mobile & Warranty Question

Hello there,

I saw a z5 compact listing on ebay with these specs:
4G FDD-LTE B1(2100), B2(1900), B3(1800), B4(1700/2100), B5(850), B7(2600), B8(900), B12(700), B17(700), B20(800), B28(700), B38(2600), B40(2300)
3G W-CDMA 850/900/1900/2100MHz
2G GSM 850/900/1800/1900MHz

The phone is a pre order from Japan. My question is will this work here in the US with T-mobile 4g lte? Or should we wait for the US release?
Also, if we order this (from USA) will Sony give us warranty given it was ordered from Ebay and from Japan?

Thanks!