Hi.. so I'm running GPA 14. Will I have to wipe and cache data to switch the bugless gingerbread?
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There will be, just not yet ...
Yes, you likely would have to wipe it unless Pete indicates otherwise.
Anytime you are switching to a different ROM, one should wipe. Reflashing different versions/upgrading the same ROM's will depend upon what has changed, and dev's like Pete will inform you whether or not you need to wipe.
Cache wiping won't ever hurt you whenever you flash ... Just remember that the phone will have to rebuild, I wipe cache and dalvik all the time ... Wiping data will be the one you are really asking about.