1. Waaaay too early - LG typically releases 4 phones a year in the US. Last year they did 5 with some help from Google. One flagship and some filler mid to low-end stuff. We've already seen the Spectrum 2 (Jan) and the Lucid 2 (Apr) this year so they've got maybe 3 phones left over the next 7 months with another Google-assist. Most likely one in the Aug-Oct window and one in Nov/Dec.
2. LG's done everything short of buying time on Fox news to let the world know about a Snapdragon 800 phone coming to Sprint. The Sprint phone may only be an update of the Optimus G Pro since that phone only made it to ATT and no other carriers have been linked to LG's new phone.
3. Sprint will NOT be launching their LG-exlusive phone from Macau.