While you will still have the Pro features of v3, those do not extend to v4.
There was a reconsideration of the licensing and it was decided that those who had the Pro version for v3, they could upgrade to v4 for a discounted price.
There was a hell of a lot more work put in to get v4 up and running and it has had updates since - I think this is why the Pro charge was reconsidered.
However, if you feel aggrieved then send an email to
[email protected] putting forward your case or how to upgrade with the discount.