"Is NGS coming any time soon?"
NO. Don't expect it before june at least.
Road map for what? Game died until NGS.
"Will Sega stop making content for PSO2 when NG comes out?"
PSO2 is dead and NGS is just pso2 2.0. I am not hyped for it, economy seems going to be really bad with daily/weeklies locked by account and not character, rip who do daily/weekly with 20-30 characters