While the K4 hasn't been properly announced, it shows up in a K10 and K7 promo video that LG posted on YouTube. At the moment, there's no word on what features the K4 is offering, but the handset is obviously smaller than both the K10 and K7 (which sport displays measuring 5.3 inches and 5.0 inches, respectively). We're pretty sure that the K4 is an entry-level smartphone that's going to be sold at a low price. For the record, the LG K10, which is the new series' most advanced handset, costs around $166 in Korea.
The K10 and K7 promo video (embedded below) makes it clear that the K series is aimed at young users, allowing them to take selfies and casual photos with ease.
Both the LG K10 and LG K7 will be released in various markets around the world (in the US, the latter will be called LG Tribute 5), and we assume that the K4 is also going to be widely available.