According to a post on the TDI Club forums it appears that Volkswagen has issued a stop sale notice on the 2012 Jetta TDI.
This is primarily due to a harmonic resonance issue with the fuel injector system. It appears the natural resonance of the injector pump is coinciding with the injectors and in some case may impede proper fuel delivery. The solution is simple enough with the attachment of a isolation dampener to assembly to alter the natural resonance. The stop sale was issued until parts can be received at the dealership.
At this time it is unclear if a recall will be involved for any or all TDI Jetta models or if it will be expanded to other models.
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