Samsung may not have announced the Galaxy Buds 2 yet, but someone has already purchased a pair. Separately, product slides for the upcoming TWS earbuds have been published by WalkingCat, which outline their battery life and auto-switching between Samsung devices, among other details.
https://www.notebookcheck.net/Galaxy-Buds-2-Spec-sheet-product-slides-and-hands-on-photos-leak-for-Samsung-s-next-premium-TWS-earbuds.553585.0.html