They do. In both twist shift and RapidFire configurations. Just not integrated brake/shifter drop bar units or bar end shifters.

I think people also forget that they still make bar end and downtube shifters for their derailleur systems...

------------------

There was a thread here in Commuting not too long ago regarding Dura Ace and Ultegra Di2, and many were all, like, "Yawn, wake me when they get this going on with IGH." So they do, and now -- much to my amusement and some project manager at Shimano's chagrin -- it's all, "Meh--no need, too complicated, they shoulda powered it off a dyno hub, etc." Love it.

Battery is fine -- if it's anything like the Dura Ace battery, you probably wouldn't need to recharge it once, riding cross country (USA). And if you did, it's not like you will never, ever be near an outlet. And I can pretty much guarantee that weight of battery setup and charger is less than extra weight of a dyno hub. Battery charge is a near non issue on current Di2 setups.

And we're talking prototypes here, yes? So we don't know that final product won't take gates belt cog/drive, that there won't be some kind of dyno conversion, and since Shimano in other news is announcing a seatpost battery, that one won't be available for this system as well. All of which, if not right out the gate, might surely appear sometime in the perhaps near future. Gotta leave room for upgrades so that those who need the latest/greatest will part with more cash, eh?

On the plus side, no need to worry about a cable freezing up. Although adjusting the cable tension for Alfine/Nexus is not an issue, it will be even less with this. Mate it to a Ui2 or Di2 left shifter, existing tensioner, and appropriate crank/FD for double chainring setup... If this is anything like the other Di2 systems, then you will probably have a choice of auxillary shifter pods for extra shifting wherever you want/need it.

Don't really see a downside to this; thumbs up to Shimano for investing in commuter IGH stuff with a Di2 drivetrain. What does it say about their commuter philosophy that they are intro-ing this before even an electronic mtn setup...? Plus there's the whole (finally) integrated road disks they are coming out with...

Not that I'd get this system any time soon. And I'd be more excited to hear news about a Sturmey Archer S2D 2sp kickback hub with drum brake...