The J-series is one of Samsungs strongest performing lines and this could be the first of the 2018 models. The SM-J337 likely the Samsung Galaxy J3 showed up on GFXBench with familiar specs except for the chipset.
A pretty modern Mali-G71 GPU provides the graphics power. The number of cores is unknown (likely just one), but this architecture is used in the Galaxy S8 (Exynos 8895) and in the Galaxy A5 (2018) with its still unofficial Exynos 7885.
The Galaxy J3 (2018) uses neither of those as it comes with only four Cortex-A53 cores. The 7885 has two Cortex-A73 cores for additional power.
Anyway, the phone sticks to 2GB of RAM and 16GB storage of which about 9GB is user available. And it will probably launch with Android 7.1.1 Nougat, this is a budget model after all.
Samsung SM-J337 Galaxy J3 (2018) specs by GFXBench
The main camera is different it has an 8MP sensors (down from 13MP) and can record 1080p video. The selfie camera has a 5MP sensor and also does 1080p recording.
So not much will change with this entry-level Galaxy J phone. The screen once again 5 big with 720p resolution, no 18:9 widescreen here like the new A-series are getting.