Difference between Pro 2 and (MTB) Pro 3 hubs

As above; anyone know what the differences between Hope Pro 2 and Pro 3 hubs (as used in some of their MTB wheels) are, aside from a non-standard disc mount? Rumour has it with the revised Pro 2 Evo internals, not much.
Also, has anyone heard if they'll be making Pro 3 29er/650b wheels?
Andy
Also, has anyone heard if they'll be making Pro 3 29er/650b wheels?
Andy
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They don't (didn't?) make a Pro 2 road hub, and their current road hubs use Pro 3 internals.
They also make some MTB wheels using Pro 3 hubs; these are either six-bolt IS or use three (XC) or four (AM) bolt disc mounts.
No, I don't think it's as straightforward as that (hence why I was asking) - for example the Pro 3 XC front hubs won't convert to 20mm, only 15mm whereas Pro 2 Evos will do all.
If you look at Hope Hoops the Pro3s come in straight pull and with either the 3, 4 or 6 bolt rotor mounts. They used to have different axles and bearings, but I don't think they do any more.