I know that with Membership you can in principle drip feed by setting up a zillion levels and migrating folk but this seems to be a steam roller to crack a walnut. In fact I can't see how to do this migration automatically anyway.
Is there any way either in the present or upcoming versions without such admin overheads:
1) Release posts and emails on a regular basis with respect to a new member's registration date? So a member may subscribe to an annual plan but have emails and posts released every week or fortnight.
2) Automatically modify the post date so that it appears 'fresh' to the member?
There are a number of commercial plugins that do this - wpdrip springs to mind - but it would be nice to have it all under one roof....It is important that new members don't have full access to a site - or they will join, get all the stuff then leave.