According to the Chinese parts reseller, iDealsChina, that iPhone 5 will hold two SIM cards to support dual phone lines.
Earlier, it's rumored that iPhone 5 will include a Qualcomm Gobi cellular / data chipset (as Verizon iPhone) which allows GSM and CDMA connections. May be this is what they mean? Dual Phone lines is highly requested option from users specially for those who have personal and business lines. what do you think?