Rumors about iPhone 4G

Rumors about iPhone 4G are heating up with new year. Apple launched its iPhone 3Gs last year. Its launch not completed a year yet and people are waiting for its new smart phone "iPhone 4G". Expectations are about the launch are till May or may be before. But no official announcement yet from Apple.
New concept is expected of new improved features with a better OLED screen and a different shape than olderr version. Also updated version of iPhone OS is expected with new technology and mobility in smart phone.
But its still a concept, I thinks. Though some analysts have talked about the upcoming technology comparing to other smart phone manufacturing companies.
Rumors about the launch of new iPhone till May seem far fetched because Apple complete its launch year and last iphone was launched in June, so guys wait when the cat will be out of the bag.

But make it sure that iPhone 4G is still a concept.