How can I collaborate with this module?

Hi, I'm the maintainer of the following modules:
Block reference - Inserts blocks into a node.
View reference - Inserts/links Views displays in a node. Viewfield has become a lot like View reference now, but with a slightly different set of features - so that is another project that might be worth thinking about now too.

I have also contributed to:
Revision reference - Like node reference but does it by the revision.

And I've done work towards Field reference which I have not completed, and I tried to make an "Any reference" consolidation module a couple years back which wound up being a massive failure at the time that I intended to revisit, and I think you guys have a better idea with the Relation module.

I also maintain a couple of Node access modules which give access depending on values in CCK reference fields, and I know of at least one other module that does a similar thing based on any relationships a node might have to something else the user is permitted to see.

People have been asking about D7 ports, and I've held off knowing that things might change quite a bit for D7.

Now my questions are:
Is Relations an API module that I would create plugins for?
Or will the information about entities come from another source?
Are 'blocks', 'views/views displays', 'revisions', and 'fields' supported with the new infrastructure?
In general: how can I move away from maintaining or contributing to separate reference modules and move the users over to the new system?

I know it might be early days for Revisions, but I'd like to think ahead a little and see if I need to make any considerations in the meantime?

I have various features in this modules, other than the 'entities' they reference, which would need to be supported by this module if I were to provide an upgrade-path for users, or at least a way given so I can hook in and provide these features. I will compile a list once I have a better understanding of the Relations module. One of the struggles I've had is that when a particular feature was added to one of these reference modules, it had to implemented seperately for the others - or sometimes forgot to do it at all, and I've always dreamed of a common way to add features to all reference modules, which is another reason I'm excited about the idea of Relations.

So I'd appreciate some feedback, and guidance about how I can learn more.