Samsung quietly put up the spec page for the Exynos 1380. (Or maybe it is a mistake since they are supposed to put up a page for Exynos 1330 for the A14 5G but A54 5G is not yet announced)

Anyway, they upgraded A78 cores from 2 to 4, and the GPU from 4 cluster to 5 cluster. Modem is slightly upgraded in download speed. ISP supports a higher sensor resolution, but video recording is still 4k30, and no AV1 decoding. It also lists UFS 3.1 storage so it is likely a hint the A54 5G will have faster storage. WiFi spec is missing though (it was mentioned for the Exynos 1280).

Anyway, many welcoming upgrades (or arguably this is what the A53 5G should have been a year ago in terms of CPU, GPU, storage. Many competitors or even their own A52s have better specs).

Some disappointments are: G68 technically can support 6 cluster but they are only using 5, and this is the old architecture from a few years ago (the G710 is already out). The A78 is also a few years old now and A710 should really be used on new phones. Recording is still 4k30, while iPhone SE from 2020 has 4K60 recording. Again no AV1 decode.

web.archive.org/web/20230220210111/semiconductor.samsung.com/us/processor/mobile-processor/exynos-1380/

The only way a price hike can be justify is if it uses the newer G710 GPU. But it looks to be another disappointment as it uses a 2 year old GPU in a modest configuration.

January 23, 2023, Mr. Alex Anderson article: Samsung Galaxy M54 leaks with design changes compared to Galaxy M53

"Seemingly, the Galaxy M54 will be available with the Exynos 1380 chipset, not the Snapdragon 888 as was believed in October."