It appears Samsung's next clamshell foldable, the Galaxy Z Flip3 will weight the exact same 183g as its predecessor, as per renowned tipster Ice universe. Sadly, there's no more information in his report as of now. Samsung is expected to change-up the design of the Galaxy Z Flip3 with a bigger outer display, which shares a matte glass cover with the dual main cameras. The total number of cameras is expected to stay at three - likely a wide and ultrawide on the outside and a selfie on the inside (possibly an under-display one, like the Galaxy Z Fold3). Flip3 183g— Ice universe...
Source: https://www.gsmarena.com/samsung_galaxy_z_flip3_to_weigh_the_same_as_flip_5g__183g-news-49319.php