A trend for 2019 seems to be multi-camera phones, which in my opinion does not necessarily mean an increase in photo quality. I consider that 2 photo cameras are sufficient, evidend if they are made very constructively, ie the quality lenses and the sensor too.
Another trend is that of flexible phones: interesting at first glance, but at a price that I do not think will succeed in conquering users.
All these trends can be tracked and commented on AndroidPit.com, being one of my favorites as news.