Last week Embarcadero made available a "hotfix" (that is a patch, not a full installation) to Delphi XE2 Update 4. You can find information on the official page http://edn.embarcadero.com/article/42282. The download file (for registered users) is at http://cc.embarcadero.com/item/28881. I applied the fix, which didn't take much time and went smoothly:
The hotfix addresses a dozen QC errors, as listed in the description. While most of them relate to FireMonkey, there are also a few for TClientDatSet and other VCL components.
Notice that you have also to update the FireMonkey library for iOS, installing the related update on your Mac. According to the description, this patch "Enables users to submit iOS applications to the App Store". There are not many details though, given this is not a QC bug but an internal one.