Anaconda RStudio 1.1.456 <-> Official RStudio-1.2.1335 (why the discrepancy?)

Anaconda's latest version of RStudio is 1.1.456.

Official RStudio is at 1.2.1335.

What's the reason?

Thanks

Since Rstudio doesn't officially support Anaconda I think this question would be better asked on the Anaconda Community