In the past few hours, I have seen two threads from the Google Mobile Help Forums reporting that these people were able to login with their password to Gmail, but for some reason, were taken to someone else’s Gmail account.
Both reports came on the fourth of January, the first said:
The second said:
A Google representative, Ethan from the mobile team, replied to both saying that they will touch base with these folks offline.
I have not seen any other reports of this, outside of these two. But this does seem a bit scary to me. I hope they figure out the issue soon and fix it as soon as possible.