Bundle overlapping might come into effect with me (and most others probably). Hopefully it will be something new with the hidden games.
With this type of customisable bundle, I would expect overlap in case people missed a previous bundle...
They did that for groupees 1. But Jonny Cappucino said that none of the build a bundle 2 games have been featured in their previous bundles.
Its an all new bundle, but with the customisable purchasing again.