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The 300 series has smaller plugs and skinnier cables. It's only for E-Bikes right now. The only adapter they offer takes a plug of each kind in each end, so it would be very messy to try to use it with a 1st gen groupset.
Di2 cables are pretty resilient to being cut and spliced/soldered if you want to route them through small holes.
grams
Ok so I'm in the process of selecting the bits for my first foray into Di2 and have a couple of questions that I can't find ready answers for: What is the actual differences between the older SD50 wiring and the newer SD300 stuff? and in a similar vein does anyone have any more details on the newly released EW-JC304 internal junction B? It seems to be a bit slimmer than the older SN-JC41 but I can't find any exact measurements online
The reason I ask is that I want to fit it internally in the downtube of a steel frame but the vent hole is going to make it pretty tight. I roughly measured it at 15mm and apparently SM-JC41 is 14.5mm wide so if these new junction is smalled that would be better.