The Wall Street Journal is reporting that Apple is currently working on an iPhone that is half the size of the iPhone 4 and a major MobileMe overhaul for release this summer. The new, smaller iPhone will be available "at about half the price of Apple's main line of iPhones." The smaller iPhone is said to be sold alongside Apple's main line of phones so maybe this summer's lineup will be the iPhone 5 at $199/$299, iPhone 4 at $99 and iPhone nano at $49.
According to The WSJ, who cited "people familiar with the matter," Apple is working on an iPhone model that is "half the size" of the current iPhone 4 and will be sold alongside the current line of iPhones; one of its codenames is N97. They state that the smaller iPhone will have an "edge-to-edge screen that can be manipulated by touch, as well as a virtual keyboard, and voice-based navigation," all of which sounds similar to the current iPhone. Though, they did mention that the iPhone 4 is expecting an update as well, so it's not certain if that update is just the evident iOS 5 that will be released or if "voice-based navigation" is different than the current voice control feature.
Apart from the iPhone Nano, WSJ says that Apple is working on an overhaul of MobileMe; they hope to remove the $99 a year pricetag and make it free while also converting it into more than just a cloud storage service. MobileMe would allow users to access their music, photos, and videos remotely from their iOS devices through the Internet so that the devices would not need to come with much storage.
On a final note, the report claims that both products are tracking summer 2011 launches (probably a WWDC launch) and Steve Jobs has made them his top priority.