I'll paraphrase as Ryan didn't supply a link...
FB4-SE is sold in four versions, outlined below:
FB4-SE Standard includes the FB4 main board, OLED display, network port and SD card memory. $695
FB4-SE RDM/DMX includes the FB4 main board, OLED display, network port, SD card memory and RDM/DMX daughterboard. $755
FB4-SE ILDA includes the FB4 main board, OLED display, network port, SD card memory, and ILDA-in and ILDA-through daughterboard. $735
FB4-SE Plus includes the FB4 main board, OLED display, network port, SD card memory, RDM/DMX daughterboard and ILDA-in and ILDA-through daughterboard. $795
If the FB3/Quickshow is anything to go by, expect to pay ~$200 under those by the time the resellers have settled down a bit.