This article has a link with a quote from Bruno. Basically reaffirming that we will know RJ identity MID-SEASON. The plot from there seems to include the reality of whether Jane will murder RJ or not. Prior Lisbon always questioned this, proclaiming, "I am the law". 

I cannot wait to see how it will play out. I believe the most likely and would be favorite RJ is Brett. 

http://www.cbs.com/shows/the_mentalist/news/1001076/