Like I said, it does seem fishy, I agree with you on that. Hell, this could be Google's "kick them while they're down" tactic for all we know. You're probably right, but what difference does it make? Blackberry isn't the superpower it once was. Government agencies around the world, including parts here in the US, have dropped Blackberry in favor of iPhones. They are losing contracts left and right. This could be Google telling the oldest smartphone maker that its time to move on.
However, for all we know, this could save Blackberry. Only time will tell. However, the Nexus 4 coming back on sale hasn't exactly received the excitement from the tech blogs out there. Most of them all seem to be focused on Blackberry at the moment. So I don't think Google succeeded in stealing their limelight.