I haven't been to the Intel TBB website recently and was pleasantly surprised at the improvements! However, the downloads page seems to no longer indicate which of the OSS releases are the commercially aligned ones. So the question is which of the TBB 4.1 updates is "commercially aligned"?
Now stable releases are pretty aligned with commercial ones (i.e. stable release 4.1 Update 2). In case there will be "special" non-aligned releases they will be marked accordingly.