While I don't have a lot of additional information.... I have heard that the Space Marine codex will be coming in August.
Please remember that these are rumors...... These sound very credible from the source. We will see. While there was more that was said, the part below was the actual rumor part... the rest setting the credentials of the rumor. So it looks good.
via anonymous sources on Faeit 212
"the new marines codex will be out in late august."