This could be the LG G4 Stylus
Like the G3 Stylus, which is a mid-range, stylus-equipped version of the G3, the G4 Stylus should be a less-advanced variant of the G4. TechnoBuffalo today revealed a render that seemingly shows the G4 Stylus. Reportedly, this is the LG LS770 that was spotted last month at the FCC, so it should feature a 5.8-inch display (unknown resolution), LTE, and a removable 3,000 mAh battery. Naturally, a stylus is also included. Android Lollipop will be on board, while a Snapdragon 610 (or Snapdragon 615) processor should power the handset.
The LG G4 Stylus / LS770 appears to be the same device that was previously presented as the G4 Note. We don't know when the new handset is going to be released, but LG will probably introduce it after announcing the G4 flagship (April 28). Whatever happens, we'll be here to keep you updated.