The Unicode Consortium announced they they had created a Unicode “Pipeline Table” page of characters scheduled for future versions of Unicode.
The table is organized by projected UCS code point number, but they are in various stages of the proposal process. Although dates of acceptance to a particular stage are posted, the target future version is not listed. Although many specifications look complete, the Unicode Consortium does warn that they are subject to change.
If you are interested in entire script blocks (particularly Ancient and lesser-known Indian scripts) coming to Unicode, you can go to the Proposed New Script page. The caveat that “things are subject to change” also applies here.