71.3 includes all the stuff from 71.1 beta, minus the new save format. It includes some changes to the way saves and thumbnails are downloaded from the server, which should make it faster.
Also, for some reason the latest beta doesn't say there was a new version available, even though there is a new release version now. The update still came up on an old version of the powder toy.
My oil cannon I've spent 6 hours on no longer works, it turns to plasma the second it decompresses. (it is at max temp). Last stable release it shot out as super heated oil, not plasma. ;-; please fix... I would publish the save and link to it but on my current network I can't publish (no idea why). I'll do so when I get back to the dorms though. For now here is a screenshot of the save.