Highly doubt that.Apparently rumour has it both the S20 & S20+ will come with the Exynos 990 and won't have 5G, the S20 Ultra on the other hand will come with the Snapdragon 865 in the UK & 5G as standard.
https://www.phonearena.com/news/Samsung-Galaxy-S20-ultra-price-release-specs-features_id121531
I would still at least one of the other S20 models to come with 5G at least in the UK, even If using the Exynos Chip.