As per the FCC filing at Indonesia, Lumia 435 sports 4 inch display with 480 x 800 pixels resolution and it will be slightly shorter than Lumia 535 phone. Further into specs, it will be powered with Qualcomm Snapdragon 200 processor and comes with 5 mega pixel rear camera. It will include BV-5J battery which is exclusive to this model. Surely this will be running the Windows Phone 8 operating system and might not be included for the upcoming Windows 10 update.
The device will be available in several variants with model number as RM-1070, RM-1071, RM-1034, RM-1068 and the RM-1032 and it will be available in both dual SIM/Single SIM version. This phone has been imported to India for testing purpose as well and the launch of this device isn’t known but as the MWC 2015 is near, the launch is certain in March 2015.