Verizon is saying 8-12 Mbps down on LTE. 100/50 is in labs. Just like WiMAX is 70 Mbps...in labs n 20MHz channels.
Still, heckuva lot better than 1-2 Mbps on HSPA. EvDO can work just as quickly as the iPhone's current HSPA setup FWIW, so i wouldn't mind a CDMA EvDO iPhone without the LTE...
10 Mbps might be aggregate over a whole tower, which with 700 MHz will cover a lot of territory. Also, lower modulations will be needed to get the signal out to all areas just like any other wireless technollogy. Verizon has been quoted as saying 8-12 Mbps is a realistic estimate for the speeds people will see with LTE gear on their network. Which still isn't bad...that's faster than 99.9% of the areas that don't have cable/DSL but will have LTE.