Cheap Dura-ace rear derailleur

With Dura-ace bringing out its new 11-speed later this year, surely the 10-speed Dura-ace may be slashed down a bit. I have full grey Ultegra 6700 and just wondered if anyone had seen any deals on a Dura-ace rear derailleur yet as its the only part I feel is worth upgrading. Would be helpful to know peoples thoughts regarding whether I will notice the difference marginally. Cheers
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Shifters tell rear D what to do so you may feel some benefit there. FWIW I was looking at getting DA7800 (the one before the current, 10 sp 7900) as the reviews of the shifters were much more positive. Still pricey though!
Rule #9 // If you are out riding in bad weather, it means you are a badass. Period.
Rule #12 // The correct number of bikes to own is n+1.
Rule #42 // A bike race shall never be preceded with a swim and/or followed by a run.
Then again the 6600/5600 are better than the latest gen, I'm hoping that the 2nd generation of the latest Shimano shifters are a step up, you may lose the unsightly cables with the latest gen but this comes at an expense.