Oppo F1 Plus was announced today durning launch event for the Oppo F1. 

The handset will feature a bigger 5.5" screen with FullHD resolution and 4 GB of RAM (normal F1 has a 5" HD and 3 GB of RAM). 

The device should be out in April this year. F1 Plus will share the rest of the specs with its ancestor F1: the octa-core Qualcomm Snapdragon 616 SoC and a 13MP main shooter.