The Samsung Galaxy Nexus has been showing up in retail database systems and the trend continues with Radio Shack now. The new Samsung/Google flagship device just appeared in Radio Shack's Cellebrite system. The phone had the SCH-I515 model number. What is also interesting is that it is called the Nexus Prime again, which means the confusion about the name is still not cleared up. Luckily, it is pretty much confirmed that Samsung and Google will not delay the device's announcement again, so we will know something concrete on Tuesday, October 18th.
Updated: Our date was off by a day. All signs point to tomorrow as the day we find out about ICS and the next Nexus device.
Source: PrimeForums via PhanDroid