At the moment it would seem pointless having dual core processors or 1.5 ghz + processors.

Before we can have that the software would have to be highly optimized (to minimize battery usage) as well as the os being designed to switch off anything which is not currently being used - i.e. wifi, micro usb ports, bluetooth to conserve battery and possibly some new battery tech to increase the battery life dramatically, as with dual core processors or powerful 1.5 + ghz processors will come more graphic intense games = more battery usage.

So hence the problem. The next big development really needs to be a new type of battery tech to tripple the current life of the N900 otherwise dual core processor + gaming = 3 hours battery life.