Here is an update.  At some point along the line, the bug referenced by jgm 
above has been remedied, which rendered the filter non-functional.  Here is 
the current working script.
Joel
System:
Windows 7 Pro
ghc 7.10.2
Pandoc 1.17.1
R 3.2.3
RStudio 0.99.863

import Text.Pandoc.JSON

pgBrkXml :: String
pgBrkXml = "<w:p><w:r><w:br w:type=\"page\"/></w:r></w:p>"

pgBrkBlock :: Block
pgBrkBlock = RawBlock (Format "openxml") pgBrkXml

insertPgBrks :: Block -> Block
--insertPgBrks (Para [RawInline (Format "tex") "\\newpage"]) = pgBrkBlock 
insertPgBrks (RawBlock (Format "latex") "\\newpage") = pgBrkBlock
insertPgBrks blk = blk 

main = toJSONFilter insertPgBrks


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