The upcoming M40 could be released by June, seeing how fast Samsung launches all the M-series models these days. There's no denying that the new model is faster than the previous ones as it comes powered by the Snapdragon 675 SoC coupled with 6 GB of RAM. Design-wise, there might not be notable differences compared to the M30 model, but rumors suggest a larger screen.
https://www.notebookcheck.net/Samsung-Galaxy-M40-pops-up-in-GeekBench-tests.420063.0.html