Lumia 530 for T-Mobile was caught passing through FCC yesterday as RM-1018. Now, seems the global variant has also passed certification in Thailand. The global product code for Lumia 530 seems to be RM-1020, which has been already seen in Adduplex database with 854 x 480 resolution.
As confirmed by size specs from FCC listing, Lumia 530 should have a 4-inch display and less capable hardware than Lumia 630. It may sport a 5 MP camera without flash and may arrive in July-early August time-frame.