Sections/Grading Q

This is definitely a rudimentary question but with the LSAT-FLEX and all the other options/changing format I'm having a hard time finding a straight answer and would love to know for sure.

Should I expect 4 sections total, and two LR sections for the September LSAT or just three sections?

Does the LR section(s) account for 50% of the LSAT grade or has that changed?