In general a few apps should be tested for new versions before install. apt update && apt install apt dpkg perl calamares
seems like a good idea. There is probably more that make sense, the older the release is.
That being said, a fresh release before Stretch goes stable (in one week) was originaly planned, but Sid did not play well, so that will not happen. After release of Stretch we have to wait until the floodgates are closed again and everything settles in Sid. So take this also as a reminder, that in one week from now Sid could be a little dangerous and dist-upgrades need to be closely watched.