Even though the Pro 3 is probably the most awesome device I have ever seen, it, in very few ways, seems like an unfinished product that leads to the Pro 4. This is my reasoning behind saying that:
1.
The pen doesn't stay attached to the Surface too good, and that is something so simple to notice that the Surface Team could've easily found that out and fixed it with some testing.
2. The prices are Apple-level high, which makes me think that this seems like funding for something even better to come.
3.
The event was supposed to be for the Surface mini but was changed to be for the Pro 3 only a short time before the event happened. This could mean the Pro 3 might have been intended for the broadwell processors but a different version with haswell processor was presented and given to journalists during the event.