Games Workshop responded with this email, which personally sounds to me like the question was not answered precise enough. However from this it appears that you could arguably use the new Imperial Space Marine for Blood Angels, Space Wolves, Dark Angels, and even Grey Knights.
If you missed the leaked rules for the new Imperial Space Marine, they are here at this link
via a reader on Faeit 212
I emailed GW Customer Service this morning asking if the 30th Anniversary Imperial Space Marine is going to be usable by all Space Marines (including SW, DA, BA and GK) and this was the very prompt response I received:
"Thanks for your email. While we do not know the exact rules, we can say the Marine can be used in all Adeptus Astartes armies."
So, based upon the above, the Imperial Space Marine could, for example, replace a Grey Hunter in a