As I understand the new rules, same departure/destination and connecting point should get you covered (if there are empty seats as always). So either way - considered a move-up for the entire itinerary or just the 2nd segment - you should be good for move-up.
As for the fee it's waived for US elites only I believe, so you would need US elite status. Since standby is not supposed to be allowed if there are empty seats available for move-up, that's only an option if there are no-shows or missed connections.
Jim