So, regardless of whether the OP received the email or it was relegated to the depth of his span folder, one thing appears evident....
Why has Phase not taken a firm position on this request and offered a clear and unambiguous response?
Email Adobe, Apple, or any other major software company a question about whether they will be providing a new feature in the future.
You will get a kind reply verifying that the feature in question is not available in the current version and stating they logged your interest in that feature (which they almost surely have) for future versions of their software.
Whether or not we will see Live Video for dSLRs in Capture One 7 will not be public until Capture One 7 is public. Such is the case for nearly all software from nearly all companies.
The reasons include (having been a programmer myself before photography entered my life):
- Keeping your roadmap secret from competitors especially given the nuances of patent laws and the speed at which market share can change with software (a few clicks and typing your CC number means you've switched software)
- When developing a feature you cannot know for sure that it will work or will "make the cut" until it does, so promising you will provide a certain feature before it is 100% ready is a big risk. If you promise something and can't deliver you are a rotten misleading bastard making vaporware; if you don't promise it and then release it everyone is happy.
Deciding when exceptions to the above two rules should be made tends to get complicated, so most software companies simply stay silent about all future features except those that are available in public betas (e.g. LR4 Beta or iOS 6 beta).
While not a "clear and unambiguous" reply (I've just explained why that's not possible), nor a reply which comes direct from Phase One, I can state that Phase One considers tethered workflow (for both dSLRs and it's own digital backs) to be extremely central to the purpose of Capture One. Clearly any feature which aids in an improved tethered workflow is of great interest to the developers. Whether and when any specific feature is added depends on several variables, only a few of which are obvious to end users.