This week Sony Ericsson have officially announced the release of the Xperia X2 along with the handset which was previously known as Kiki. The Xperia X2 is the successor to the popular Windows Mobile Xperia X1. The X2 will also run Windows Mobile but the updated 6.5 version. Engadget were also able to preview the Xperia X2, which at the moment, Windows Mobile 6.5 isn’t finalised, so there’s a bit of lag in the UI. The Xperia X2 also features an upgraded camera coming it at 8.1 mega pixels. Release date is set for Q4 of 2009, so hopefully we should see the handset before Christmas. You can view the video by Engadget after the jump.

The other Xperia handset announced, is not the Xperia Rachael, aka X3, but rather the handset we formally knew as Kiki. The handset, well known specs are limited at the moment, we have known it will feature a “transparent screen”. Again we have a video showing this which you can view after the jump. The display is visible from both sides of the handset, but if it only displays during certain screens or can be turned off is currently unknown. Hopefully it can be turned off, or not on during certain screens, other wise text messages soon won’t be very private. The handset has been named Xperia Pureness and is due for release also in Q4, with November as the month the coming is aiming for.

Both handsets will launch in selected markets during Q4. No price is known as of yet.

The mysterious handset from Sony Ericsson, Kiki, has passed through some of the net world as an unknown, strange, Sony Ericsson handset. Upon closer inspection, the handset bears the Xperia wording. Unlike the previous Xperia handsets though, it appears to lack the touch screen keyboard and takes on a transparent screen instead. While any specs of the handset are still undiscovered, some more photos of Kiki have surfaced.

News has been flying around lately about all the upcoming Xperia handsets from Sony Ericsson, but have you been keeping track? Here to help you out, is a quick review on the upcoming Xperia models, as well as the current Xperia X1.

The Xperia X1, currently on sale around the world is the first Windows Mobile handset from Sony Ericsson. The handset also features a touch screen and slide out QWERTY keyboard. Camera wise it features an impressive, yet slightly outdated 3.2 megapixel camera.

The next Xperia handset, the X2, aka Vulcan brings the camera up a notch to 8.1 megapixel. Also updated will be Windows Mobile, the X2 is set to use Windows Mobile 6.5. Other similar specs of the handset includes a 3.5 inch touch screen and a QWERTY keyboard.

Images and specs have also been floating around of the Xperia Rachael, which was originally thought to be the X3 although some are suggesting that Rachael is in fact X5 which we’ll come onto next. Currently, the X3 is rumoured to be a mysterious handset, going by the name of Kiki. Not much information on Kiki at the moment apart from the screen. Kiki uses a glass screen with a rear projected image. Xperia wording can be found on the back of the handset, which is the only thing currently that points to the Xperia brand, as there’s no QWERTY keyboard to be found. Kiki is also supposedly running Android.

Also running Android and receiving much more hype than Kiki, is Rachael. Abandoning Windows Mobile in favour of Android has got a lot of people excited. No visible QWERTY keyboard on the handset, but perhaps the increased screen size reflects the absence of it. Coming it at 4 inches, it’s the biggest of the Xperia screens. As for the Xperia X4, no information has been released on it, but perhaps Kiki could be the X4.