My two 737 flights over the past couple of days have been on the new config. The usual old hanging perspex divider was in place between J and the newly cavernous row 4. Perhaps some aircracft had them temporarily removed for some reason. FWIW both flights were on non-BSI aircraft.
I had 5A on both flights with a 5B shadow in both cases. Only a smattering of other empty seats, including a few other forward middle seats, presumably also shadows.
As a newly minted WP I'm of course happy with the additional legroom at no extra cost. But for many years as a SG doing too many Golden Triangle flights in Y, I benefitted from getting seats in rows 4 - 8 on most flights at T-80 - and strategically getting plenty of de-facto shadows when there's a higher status pax in the row. I guess T-24 is the new T-80 for Golds.