The new colours appeared on the Hungarian Samsung site but are also expected elsewhere in Europe. They are available for both the Galaxy S20+ 4G and the S20+ 5G. Samsung introduced the Galaxy S20+ in February of 2020. It was originally only available in the colours Cloud Blue, Cosmic Grey and Cosmic Black.
A few months later Samsung also announced the dark blue version Aura Blue. It was previously released together with Aura Red and Cloud Pink in South Korea. This is a strategy that Samsung often uses. It gives providers the exclusive right to sell a specific colour. Something that always does well in terms of sales. The same seems to be happening for some versions of the S20+. For example, the new colours of the S20+ 5G are not for sale directly from Samsung in Hungary, but thru an exclusive partner. It will therefore take some time before all the new colours are widely available.