Here's an interesting upgrade issue. The press release I got off Dpreview says:
Existing Capture One 4 PRO customers can upgrade to Capture One 5 PRO for 99 USD and 69 EUR. Existing Capture One 4 customers can upgrade to Capture One 5 PRO for 299 USD and 229 EUR.
...and the release notes Jack posted seem to confirm this
BUT folks on the LUF (l-camera-forum) are saying that if you got v. 3.x with your M8 and upgraded to v. 4 for free, you are not entitled to the $299 upgrade from v. 4 to v. 5 Pro. The Phase One website won't accept your serial number. So you have to pay the full price of U.S. $399. Which makes a brand new copy of Lightroom $100 cheaper than upgrading.
I hope this is a mistake. If it isn't, it leaves a very bad taste, and Lightroom becomes, possibly, a more attractive option for M8 users. We shall see.
--Peter