A report from Bloomberg cited "person/persons familiar with the matter" four times, so we will approach this story with the deserved amount of skepticism. According to the report, Apple could be releasing an LTE-enabled Apple Watch alongside the iPhone 8 or toward the end of the year. But according to "another person familiar with the matter" (from the same report, mind you) it could be delayed well into 2018". Do you see where the skepticism comes in? Anyhow, Apple had reportedly delayed an LTE-enabled version of the Watch before the Series 2 launched but had to put it off because it...
Source: http://www.gsmarena.com/lteenabled_apple_watch_series_3_said_to_debut_by_the_end_of_the_year-news-26602.php