If you take a lot of photos with the lens cap on you should wait to the fix. If you shoot with the lens cap off, buy it now and enjoy. I see the change in metering on my 2 bodies, but only with the cap on. I can't do anything to get the metering to change when the cap is off. I've tried indoors out, full sun and long exposure indoor dark photos. The light leak is a non-issue.
There are many other issues that actually affect photos with this body. I consider this list of minor issues far more important then the alleged light leak.
The Auto ISO does not work if the flash is on.
The focus point should light up before focus lock.
Some images do not receive the correct time stamp.
The card read setting changes by itself if the camera detects a card has been removed.