The head of Microsoft's smartphone section, Andy Lees, has confirmed to AllthingsD that there will be Windows Phone handsets running dual core system on chips and 4G LTE released as and when engineers are able to strike the right balance between battery life and features.
Understandably, he reaffirmed the fact that despite the apparent inferiority of single core devices powered by Mango, he suspects "they will be faster in usage than any dual-core phone that you put against it, and that’s the point” (ed: albeit a very moot one).
He also explained that Microsoft is working on the next major update already, possibly v8.0, with another minor update inbetween.
“If your pace is too short, then the magnitude of what you can deliver gets limited because of the time it takes to do all of the testing required to ship at very, very high quality,” Lees cautions. “Having said that, what you don’t want to do is just have huge, great long release times where you’re out of the market,” he added.
It's worth noting that a bigger screen, a dual core SoC and the introduction of 4G baseband chipsets will likely have a negative impact on battery life, although this hasn't dissuaded Android rivals.