The 3 versions of 777-200ER configuration are:
Version 1 F12C28Y261
Version 2 P8C28Y225
Version 3 R8J26Y212

Version 3 777-200ER is to operate following service:

Seoul - Dallas
Special Note: Version 2 777-200ER is being introduced along with Version 1, so this route is being mentioned in particular.

21JAN10 - 28FEB10 Day 4
01MAR10 - Day 46

Seoul - Seattle
27OCT09 - 30NOV09 Day 26
01DEC09 - 27DEC09 Day x135
28DEC09 - All 5 weekly service

Seoul - Tokyo - Los Angeles
01JAN10 - 09FEB10 Day 5
10FEB10 - Day x247

As of 15JUN09, January 2010 sees 3 versions of 777-200 opeating:
Ver 1 Day 1 (till 18JAN10)
Ver 2 Day x15 (Day x5 from 25JAN10)
Ver 3 Day 5

Seoul - Washington DC
01NOV09 - 30NOV09 Day 15
01DEC09 - Day x247

All dates, and operational days are based on GDS inventory display as of 15JUN09, and is subject to change at anytime.

Version 3 777-200ER configuration based on GDS seat map display is the following:

Kosmo (FIRST) 8 Seats
Row 1- 2
A - DE - J

Prestige 26 Seats
Row 7 - 10
AB - DEF - HJ

Exception:
Row 10 HJ

Economy 212 Seats
Row 28 - 40 / 41 - 52
ABC - DEF - GHJ
Wing section: Row 28 - 39

Exception:
Row 39 AB - DEF - GHJ
Row 40 DEF
Row 41 ABC - GHJ
Row 52 A - DEF - GHJ (52B either not installed or simply appeared to be blocked)

Version 3 777-200ER sees 1 less row of Economy compared to Version 2

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