From rumors to forgotten previews, there are many smart phones that we are waiting to see. Leaks often give us glimpses of promising new technology that often become bitter memories when manufacturers decide to cancel production or completely change an upcoming device. Here is a quick list at several handsets that we are hoping would make it to the production line.

First up is an Android handset with a 5.5 inch touch screen display from Sony Ericsson. The device was leaked along with the upcoming SE XPERIA Shakira and the W150 TeaCake. According to the leaked report, the device is an Android smart phone. Looking at the leaked images alone makes us wonder when this impressive tablet hybrid smart phone will actually be available –it even has a slide out QWERTY keyboard that allows it to be used as a netbook.

Right after the launch of the Nexus One, there was plenty of talk about a new handset from Motorola that might possibly end up as the Nexus Two. There were rumors that the next Google phone needed a keyboard and at that point, Motorola’s Milestone/DROID was the best basis for an Android with a keyboard.

By the time word of the Shadow handset in production became public, people were already looking at it as the next Google device. Recent news updates have revealed that the Shadow is still in production.

When it comes to high end Android, no other rumor seems to be as delicious as the upcoming HTC Scorpion (though the Sony device is starting to overtake everything else). This handset is said to be equipped with the latest Snapdragon CPU and is said to possibly be clocked at speeds more than 1.2 GHz.

The Samsung Galaxy S Pro may be the least impressive of these four, but with the already good specs on the original, all it simply needs is the QWERTY keyboard (hence the Pro on the name). So far, Samsung has not commented if the Galaxy S Pro will be made.