LEGO has published the inventories for the 2019 releases at its customer services site which means we have been able to import them into our database.
Often the company initially publishes those for the January sets without the new parts included but that's not the case this year. Over one thousand new parts have been exposed which you can see here and here.
The vast majority are recolours, as you'd expect, but there are some new System parts, or at least parts with new Design IDs. You can view them using an undocumented feature (tag-none) here and here. That trick will work until we start to tag them in the next few days. There are also a few Technic parts with new design IDs.
A brand new colour has been introduced in 70828 Pop-Up Party Bus which, according to New Elementary, has the LEGO ID of 353 and is named Vibrant Coral. So far 13 parts have been cast in this very attractive colour, and the set contains 116 of them.