I noticed that rumor has it, the feature will only be available as a extension for phones and tablets. That would mean that you would not be able to share your number with a iPhone and a Android phone.
Overall, I'm exited because, this could mean that I would be able to use both iMessage and a Android phone on the same # without switching the sim! Thus, for the iMessage numbers that do not go through, they would be routed to my iPad.
However, I'm guessing that if this is the case, I could use a Cellular iPad for my iMessage to get around the disconnect of having a android as my DD!
Overall, I'm extremely exited for this feature and, can't wait for it to be implemented🙂!