They did say that they had no plans to make any more astros in the CW line. I think their reasoning was that they doing "minor characters" in the CW line. This is really stupid of them, as some R2 units like Ahsoka's R7-A7 and Kit Fisto's R6-H5 are pretty prominent in their respective episodes, and obviously have a special relationship with their Jedi, complete with "dialogue" not unlike Luke's or Anakin's with R2-D2, and with R6 actually piloting his ship to the rescue of Kit from Grievous' fortress.
Certainly more astros would be a great way to make some extra money in the line, seeing as how there's almost no tooling cost (unless they do that cool green R5 unit), and every kid needs more astromechs than just R2 or Goldie to put in their jedi fighters, Y-Wings, and ARCs.