As I've been thinking about this issue more, it might not be the end of the world if Dev Force doesn't move to the Microsoft.Bcl.Async package right away. We only upgraded our project to use the new package somewhat recently. Before that, we were using the Async Targeting Pack. And actually, we've been somewhat unhappy with the new package because it makes stack traces almost useless. The old Async Targeting Pack did a much better job of giving us helpful stack traces.
Also, we never really had any problems (that we know of) related to using the old package. Microsoft is certainly pushing the new package but it seems like the old one is still perhaps a valid option.
I look forward to hearing your thoughts.
Thanks,
-Stephen