I've just installed beta 2 and I found over 500 outdated phrase... I don't think that these phrases are changed from beta 1
But Mike, the outdated phrases are identical from previous versions...Outdated phrases aren't just outdated from the previous version - they're any phrase where the master version is newer than your custom version. What @Alluidh says is correct.
Note that there may be typos or things in the master version which changed which don't apply to your custom version.