4.26 (which should go out today...) will mostly be bug fixes accumulated along the way, and some other fixes that are outstanding.
4.27 is scheduled to include EIP for the browse. However that _may_ come in stages. (For example 4.27 may just support check boxes in a browse, with 4.28 supporting entry fields and so on.)
As you point out this has the potential to get really complicated, what with validation and all, so I need to step very carefully. But EIP is definitely a useful feature that I want to add in the not too distant future.