Think we'll see a Dura-ace version once the UCI approve their use in races.

Likely in 1~2 years. Or if the market demand is high enough, they would put it together with their 'mainstream' groupsets. Just like their compact cranksets.

oooh this looks nice!

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Madone Five Series 2013
Shimano Dura-Ace 9000
Mavic Cosmic SLE 2013

Ultegra Di2 looks amazing.

Found this from a blog of the Shimano product presentation in Malaysia.

Now official.

http://road.cc/content/news/86557-ultegra-6870-di2-and-road-discs-unveiled

"Di2 is the opposite of mechanical groupsets in the sense that it's the derailleur, not the shifter, that's speed-specific. So you'd be able to use the new levers with old 10-speed mechs but you couldn't swap your old Di2 rear derailleur our for the new one."

Bad news if it's true.

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It's online again:The Machinist

It seems this is a wrong statement when you read the bikerumor article. Everything is compatible.

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It's online again:The Machinist

Given that the RT-99 discs are centre lock only, what are the recommendations for lightest affordable hubs that will suit the centre lock system ?

DT Swiss 180's are the lightest center lock hubs that I have found but they are pricey, otherwise 240's.

I don't see any hydraulic rim brakes

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K2

Do you suffer more when you train, or cannot train?

Not convinced that is accurate, I think I have seen 10spd Ultegra shifters working with 11spd Dura Ace front and rear mechs. The shifters are just switches and the connections must be the same. The Ultegra 6770 shifters DO work with the new junction A and internal battery, that I do know.

I believe that is specific to the new 140mm Icetech rotors seeing as there are currently 6-bolt IceTech 160mm rotors available.

While I have no experience, Shimano has been very forthright in promoting the fact that assuming components have been updated to the latest firmware, any e-tube Di2 component is interchangeable with any other within the limitations of the component. What that means is that if you have a 10-speed Di2 e-tube compatible group and want to go 11-speed, even though the 11-speed shifters will work with a 10-speed e-tube rear derailleur, there is not a firmware update to make the rear deraileur shift 11-speeds so this will also require an 11-speed rear derailleur and cassette.

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Michael - The Anaerobic Threshold is neither...

As soon as the UCI approves disc brakes all bikes will have those, so i understand Shimano not wasting time in something that will disappear anyhow.

I would tend to agree but some might argue there is a place for them seeing how SRAM Red 22 hydraulic shifters and rim brakes apparently helped keep Cavendish upright the other day near the end of the chaotic first stage at the tour!

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Michael - The Anaerobic Threshold is neither...

His comment smell more like a plug for the sponsors too me. On dry roads, flat roads breaking seems more about what the tires can handle than any claimed hydro rim break advantage.