( CNN ) -- The last full day of the Mobile World Congress show in Barcelona has drawn to a close . After a bonanza of new phones , tablets and mobile gadgets , here 's the last of what 's new at this year 's show , courtesy of Stuff Magazine . Quad-core arms race 'ridiculous ' Microsoft Windows Phone Director Aaron Woodman has stated his belief that competition between manufacturers to produce phones with faster and faster quad-core processors is unnecessary . `` The quad-core arms race is ridiculous , '' said Woodman . Instead , he explained how Windows Phone devices like the Nokia Lumia 800 are able to run fast without using battery-sucking quad-core innards . Microsoft has even gone as far as handing out â‚¬100 ( $ 133 ) to anyone whose phone can beat a Windows Phone in a one-on-one user test during MWC . Microsoft releases Windows 8 preview . Microsoft announced the release of the consumer preview of its forthcoming Windows 8 operating system . The new software is designed to work on both computers and tablets , taking many design cues from its own Windows Phone 7 software . The company said it has made a staggering 100,000 code changes since the last preview . Early testers will be pleased to know that all apps in the Windows 8 app store are free to download during the preview . LG phone delayed by UK 's lack of 4G . LG 's recently revealed Optimus Vu smartphone , which sports a 5-inch screen with an unusual 4:3 aspect ratio , wo n't be seen in the United Kingdom for at least a year . The long wait is due to the UK 's lack of a 4G or LTE network . Other countries such as the United States are already enjoying super-fast 4G mobile data speeds while the UK lags behind . Samsung previews projector phone . A prototype of the Samsung Galaxy Beam projector phone has been doing the rounds . The smartphone prototype runs on Google Android 2.3 and has a 15 lumens projector built into its top edge . Users can beam a 50-inch image on a blank wall or screen , perfect for showing off holiday snaps or giving impromptu presentations .
Microsoft executive calls quad-core processors unnecessary . Aaron Woodman says Nokia devices running Windows Phone are just as fast . Comment: