FCC approved Samsung i770 and U430 for Verizon
Judging by its model number, Samsung SCH-U430 is the successor of the U410. You shouldn't expect anything great from a phone that most probably will be free with a 2-year contract.
Samsung SCH-i770, on the other hand, is an interesting model. It should be the successor of the i760, a Windows Mobile Professional smartphone with touch screen and a QWERTY keyboard. FCC reveals information that is CDMA/GSM hybrid, but unlike the rest "World" phones of Verizon, this one also supports the U.S. GSM frequencies. This means that if it is not locked, one will be able to use it with AT&T or T-Mobile SIM card. However, it is unlikely that Verizon will allow this to happen. i770 also features Bluetooth and WiFi.
source: FCC (i770, U430)