As this is my first time installing these update candidates,
Actually we moved first batch of packages that landed in testing to candidates repo, to avoid mix up in the second batch that just landed in testing repo. Since nothing new appeared in candidate you should probably already had them before, home this is clarifying what is actually happening
Next yum update should just pull the latest stable versions?
Not if you already have installed then from testing (or candidate) repo, because versions are same, it's only the distribution channel that change, no impact for testers.