As well as the first 5.0 beta, Gutenberg has also started to show up on the Dashboard as a prominently promoted optional recommended plugin upgrade for 4.x inst

As well as the first 5.0 beta, Gutenberg has also started to show up on the Dashboard as a prominently promoted optional recommended plugin upgrade for 4.x installs sometime recently (I noticed earlier this week and installed it to trial it immediately). I'm guessing that Dashboard push may have motivated this being posted here.