We all know they exist, and Google knows we know, and yet no one is supposed to know that we know that they know. You know?
Metaphysical crisis aside, I'm deeply curious as to whether Google will still announce the products on Monday. They might not have a choice; I figure at least one of the partners will not get the message and post the press releases anyway. That could result in Google being in a position similar to Pocketbook and Qualcomm at CES 2011.
Pocketbook accidentally released their CES 2011 press release early, and it included mentions of the Pocketbook Mirasol eReader. That device ended up never being released, but at the time everyone thought it would be announced eventually. For some time during 2011 I amused myself by asking Qualcomm and Pocketbook about it just to hear their denials.
And we could see the same from Google. Now that would be fun.