I can see why they'd want to keep the same voice actor for Cloud, even if it would be a bit jarring. The same guy did it in Japanese, Sakurai Takahiro, and he did a good job of lightening his voice a bit for the younger Cloud.
And yeah, officially denied, but I'm just waiting for Squeenix to announce they've changed their minds. Heck, I'm surprised Sony's not nudging at them to do it, because the screaming FF7 fans would go out and get a PS3 for that, which would greatly help the sluggish sales. It would be a win-win for everyone, so Squeenix needs to get with the program already.