There are some critical differences here. Especially, if I understood correctly the discussion we had at FOSDEM, the fact that OpenOffice is not going to be on install media or in the default package selection allows for some flexibility with respect to deadlines.
What the proposal is meant to ensure is that Fedora 19 users will be able to install OpenOffice 4 from the official Fedora repositories and without experiencing any conflicts with other packages. It seems clear from the current discussion that some preparation work is needed, especially concerning the LibreOffice packaging, so this needs to be addressed before Fedora 19 is released.
If it helps to package 3.4.1 as an intermediate step, fine. This will still allow us to clarify issues and fix packaging conflicts. But we will then want to package 4.0 as soon as it is released as stable. I thought that the policy would forbid such upgrades but (again at FOSDEM) I got feedback that this is up to the packagers too. Anyway, if this plan accommodates concerns about packaging pre-release software, I could be OK with it.
OpenOffice has three wikis and a lot of outdated content. Just rely on the link in the proposal. The page you mention won't get updated.
OpenOffice 4 will be released when it's ready. That's it. April 2013 is an estimate to have a timeframe for collateral activities (such as logo design), but the project will use more time if needed and reasonable. I know this doesn't fit well with a time-based distribution release policy, but the project won't release as stable something that has not been tested enough. Some parts, for example the accessibility work, have made much more progress than what we expected; but for some it's still hard to have anything more than a tentative deadline.
(As for your suggestion, I needn't check with companies or individuals what their schedule is: I'm up-to-date with the current progress.)
I noticed itinstalled to /opt which is an immediate violation
of the packaging guidelines
What we are looking at is the 3.3.0 spec file (F14). Packaging will be based on that (and perhaps on the LibreOffice spec file), and not on the RPMs available from the OpenOffice site.