Sony Xperia development is a whirlwind of sharing and porting. There seemingly isn’t anything released on any given Xperia device that isn’t eventually ported to the other Xperia devices. From the launcher, to apps, and many other things, the Sony Xperia line is the epitome of developmental sharing. That said, the Sony Xperia Arc as well as the Sony Xperia Mini, Mini Pro, Active, and Ray have all received a port of the Sony Xperia S lock screen.
XDA Senior Member AeonWorld ported the lock screen to the Xperia Arc. A few days later XDA Senior Member ThrilinaC ported the mod to the Mini, Mini Pro, Active, and Ray. However, during that port, ThrilinaC also added a mod to customize the app shortcuts on the lock screen. This mod was then brought back to the Xperia Arc. Awesome.
For all the devices, the mod is pretty simple to apply. Just download the appropriate file and flash in custom recovery. The mods are only compatible with the stock ROMs at this time, so if you want to check it out you may have to roll back to rooted stock, although it’ll likely be added to custom ROMs in due time.