It's entirely possible, but is not something that will happen for each and every case. What has been observed is also the opposite, once the I-140 is approved, the LUD on a concurrently-filed I-485 may also change even though it won't be adjudicated right away...
(Note: I am not speaking out of experience because my I-140 isn't approved yet, but am basing my response on other posts I've encountered on this site over a long time...)
