We’ve known for a while now that the BlackBerry 8700g is coming to the UK in February, however, it looks like O2 has the BlackBerry 8700g on their site just a bit early.
There has been no official announcement about the O2 BlackBerry 8700g either from O2 or BlackBerry. Seeing how O2 has updated their website with new device one can assume that official announcements are coming soon.
In addition to the O2 BlackBerry 8700g website, there is a pdf price list that you can download here.