Terraria 1.3.1 is expected to be released on Sunday, May 22.
I'm going on a trip on Tuesday, May 24.
If I can get RomTerraria updated for 1.3.1 before I leave, you'll have it. If I can't, I'll try to work on it evenings during my trip and have it out as quickly as possible.
Sorry about the lack of clarity here. I have no idea what is changing, so I can't make any guarantees about my ability to quickly update RomTerraria to support it.
That said, I've got a nice 4K monitor hooked up at home now so it will be easy to test...