Why isn't the new Surface Pro named 'Surface Pro 5?'

[Windows Central]

There is no "Surface Pro 5," only Surface Pro. Here is why numbers don't mean anything.
Microsoft is dropping the numbering system from the names of the Surface Pro lineup. Instead of an anticipated Surface Pro 5 the company is going for just "Surface Pro" this time around.
We spoke with Microsoft about the shift in nomenclature and why it matters.

Full story from the WindowsCentral blog...