Ubuntu 19.10 is officially released (10-17-2019). As this is an “interim” release which is supported for 9 months, about 95% of Ubuntu users usually elect to remain on the latest LTS (long-term-support) version of Ubuntu which has a 5 year support cycle.
But, if you like to see the “latest & greatest” features and updates (“bleeding edge vs leading edge”) – then feel free to do the online update. Just be sure you understand the best way to process the update.
See here for more inf0: Eoan Ermine
BTW: The term “Ermine” is another name for the common “Stoat” – – an especially capable predator. The Ermine label often refers to the winter coated version of the stoat (white color with a black tip on end of the tail).