The Nuremberg Toy Fair (Spielwarenmesse), one of the largest toy industry trade shows, concluded at the beginning of the month, and several diecast companies previewed new releases for 2019.
Various companies’ social media pages also feature previews of their 2019 models:
Almost Real (Facebook)
Sun Star (Facebook)
Additionally, several companies have catalogs/lists for their upcoming models for 2019:
Post what you come across as well, and the article will be updated with more links.