I rather doubt it will be a final build number as normally the builds don't go from that build to a regular release as something is invariably found in that build that is the purpose of the pre-release build to test against those with problems in the earlier regular release.
So you have to monitor the forums and see if a) any of the problems reported in 864 weren't resolved or if 874 brought its own issues. If either is correct then it is almost a certainty that when released it will have a different build to try and resolve those outstanding issues.
So few bugs doesn't mean no bugs and it depends on how serious those are there is little point in releasing 764 as a regular release if there are outstanding issues, which would ultimately result in yet another further program update being necessary.
