Welcome to the Rockbox Technical Forums!
All of the builds on the current build page are built with the most recent code changes, so, yes, it is the newest available build. The current status of all current Rockbox ports can be found on the front page (www.rockbox.org). According to the front page, the M:Robe 500 is listed as Unstable, so it might not be very usable for you yet, though you're willing to try it if you so desire.
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