Mild Speculation, yes. But hardly "gross".
Prior to the unveiling of the Mazda6 at the Paris Autoshow, all Mazda6 MPS concepts shown were said to be Twin-Turbo models. And the turbos were to be sequential for maximum gain across the whole power curve.
In the announcement at the Paris Auto Show, Mazda stated this in their Press Release,
Quote:
A single turbocharger covers all speeds:
The merits of the direct injection system noted above make effective boost possible from low through high speeds using a single-scroll turbocharger, which is light in weight and simple in construction.
...while also omitting the second turbo that they had previously had in their concepts.
It's not much of a leap to figure that the dropping of the second turbo and the addition of the direct-injection that wasn't there before are directly related to one another since their affects are very similar. The fact that Mazda made a special bullet point in the press release to state why they only used a single turbocharger (when all the previous concepts had been sequential twins) and that direct injection fulfilled the need for a sequential system, is further proof that the two are related.
So, yes, Mazda hasn't come right out and said "We dropped the twin-turbo in favor of direct injection" in that exact phrasing, but it's pretty clear through the press release.
