One of those pictures shows the C-A15 having 8 cores per chip, but the other lists 32 cores. Makes sense if it's a 4P system. Does ARM have anything similar to HT or QPI?
The lack of 64-bit cores may also be a barrier to entry. At least the C-A15 has 40-bit addressing.
I got the idea of an efficient low cost smartphone (not necessarily using Cortex A5) from the "prepaid iPhone"/ "iPhone Nano" rumor. More information
here.
I know Cortex A9 is faster, but don't those phones cost a good deal more money to produce while cheaper smartphones phones like the Android LG Optimus V (65nm ARM11) suffer in the battery life department?
P.S. Please take this argument in context of the world mobile market where phones are usually not subsidized. Essentially Apple or MS could use this type of vertically integrated strategy to undercut the Android handset makers (who are forced to rely purely on profits from the devices themselves).
Based on iSupply estimates, the A4 that Apple uses in their products costs about $10. If you're targeting the low end of the market you might not even need something as powerful as that. It's also built on a 45 nm process so you could cut costs with a die shrink as well. You can limit the rest of the costs by not including as much RAM or flash memory as well. Using a cheaper display would go a long way as well.
Apple has some chip design teams that it's purchased over the past few years so they do some customization of their chips. I don't think they have sufficiently many engineers to devote to multiple product lines. If they are producing such a phone, it's likely that they'll use an A4 whether at 45 nm or something else. Right now the lowest end iPod sells for $220. Prices will come down, but they would need to add additional phone components which would drive the cost back up.
Apple also likes to maintain a certain amount of margin. They're not going to release a product that's not profitable for them. They may also risk cannibalizing their high-end products as well which is even less desirable for them. Apple may make a play at those markets, but they're purely content to have a small market share as long as it's the most profitable part of the market.
Microsoft on the other hand doesn't make hardware. Their hardware partners are the same people who are currently deploying Android on most of their handsets. Outside of paying for developers to produce customized Android for a manufacturer's device, Android has no cost for the handset manufacturer to use. Microsoft charges a license fee for each copy of Windows Phone 7. Racing towards the bottom is not in their interest as the lower the total price becomes, the larger the license fee for the OS becomes in proportion to the hardware. That makes it even harder for Microsoft to compete against Android. They'd prefer to move devices with a high ASP where the cost of their OS doesn't make as much of an impact.