Thanks for the fast reply Snakeoil. I expect you are correct. Once Roku has FW which fixes the bug in one product, it makes sense that they would need to create and test updated FW for every product that has the bug. This doesn't happen in zero time. In fact, they may even decide to give the early FW receivers a little run time before releasing fixes for every product.
As long as you have fixed FW, I'm fine giving Roku time to finalize the fix for my model.