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Rotors are purchased separately. Depending on your frame and rotor size you might/might not need adaptors to mount calipers on. Don't draw parallels to rim brakes in terms of expense and amount of stuff you need, the whole disc brake thing is to shift more shite at £££.
There isn't an official hydro group; some retailers are just creating a bundle by mix and matching. But for a disc brake road bike that should do with the bits that you need to buy separately.
amey-
So, I'd save a lot of hassle (but less money) buying something already Di2 and disc. I'm not actually sure that exists - maybe the Diverge Pro Carbon? Other options that fit: the Izalco Max Disc, Pivot Vault
Actually the Trek Domane 6.9 Disc is Di2 w/ hydro, but it's £6000
When we're in the Brave New World, everything will be disc and we won't have to worry about compatibility... riiiight
hippy
Is there a different hydro group or is it just the levers that I need to worry about?
"rotors (adapters)" - what's that then? The discs will come with the wheels right? I won't need to buy them separately unless I got a non-disc bike to build from, which seems a bit silly.