Here's from the Transfer page of the Gazzetta dello Sport, a post made 9.55 this morning, and they have not moved a millimeter from when they originally broke these news exclusively last weekend:
9.55 — Mercato Inter: Wesley Sneijder entro Ferragosto non sarà più un giocatore nerazzurro. Passerà al Manchester City, club con il quale la cessione è stata già perfezionata, e con anche Eto'o in uscita, il club di Massimo Moratti ha necessità di pianificare un'offensiva sul mercato. Uno dei primi obiettivi, di cui si parla da tempo, è l'argentino Tevez, rientrato al City (da dove però vuole andare via), disposto a calarsi l'ingaggio. Le altre opzioni dell'Inter sono Kucka (vicinissimo l'accordo con il Genoa) e Lavezzi del Napoli, con il quale si lavora per uno scambio con Pandev.
It says:
9.55 — Inter's transfer market: Within August, Wesley Sneijder will no longer be a nerazzurro. He will go to Manchester City, the club with which the sale has already been concluded, and with an Eto'o on his way out, Massimo Moratti's club needs to plan an offensive move on the market. One of the first objectives, which has been talked about for a long time, is the Argentinian Tevez, who is back at City (from where he wants to leave, though), and he is ready to lower his wages. The other options for Inter are Kucka (very close for an agreement with Genoa) and Lavezzi from Napoli, for whom an exchange deal with Pandev is being hammered out.
I don't know what it's worth to you, but for me it can't be clearer than this: Another categorical statement that Sneijder is a done deal for City. For Gazzetta to insist with this, they know things that others don't know, or they are risking their reputation on a gamble.
The way Gazzetta back their story, it would be unprecedented if it turned out to be false, or even worse, a guess.