Sorry, I do not have answer at your points but I know that too much expectation have been built around OS2 and now we have to wait another month to get maybe something close to it!
This is suicide marketing strategy, good hardware but poor software that does not allow to show off all the device potentiality!
RIM surprise all us and release now what you have ready as OS2. Do not worry if it is not perfect, we loyal customer are ready to play and test for you ! !
I can be corrected if I am wrong but, by definition, since RIM keeps all owners on the same OS, and controls all OS updates, I highly doubt there will be a "leak" for the PB.