I went back and looked at reveal dates and it was quite a bit different for G&K. They revealed 5 civs right off the bat. We've had to wait 28 days to get to the same point with BNW.
Anyways heres my guess:
G&K:
Netherlands - Confirmed February 16th (Announcement +0)
Celts - Confirmed February 16th (Announcement +0)
Maya - Confirmed February 16th (Announcement +0)
Byzantium - Confirmed February 16th (Announcement +0)
Carthage - Confirmed February 16th (Announcement +0)
Huns - Confirmed March 9th (Announcement +22)
Austria - Confirmed April 6th (Announcement +50)
Ethiopia - Confirmed April 6th (Announcement +50)
Sweden - Confirmed April 20th (Announcement +64)
BNW:
Poland - Confirmed March 15th (Announcement +0)
Brazil - Confirmed March 23rd (Announcement +8)
Assyria - Confirmed March 23rd (Announcement +8)
Zulu - Confirmed April 12th (Announcement +28)
Portugal - Confirmed April 12th (Announcement +28)
Morrocco? - Confirmed April 26th? (Announcement +42)
Civ #7 - Confirmed May 17th? (Announcement +63)
Civ #8 - Confirmed May 17th? (Announcement +63)
Civ #9 - Confirmed May 31st? (Announcement +77)
Anyways heres my guess:
G&K:
Netherlands - Confirmed February 16th (Announcement +0)
Celts - Confirmed February 16th (Announcement +0)
Maya - Confirmed February 16th (Announcement +0)
Byzantium - Confirmed February 16th (Announcement +0)
Carthage - Confirmed February 16th (Announcement +0)
Huns - Confirmed March 9th (Announcement +22)
Austria - Confirmed April 6th (Announcement +50)
Ethiopia - Confirmed April 6th (Announcement +50)
Sweden - Confirmed April 20th (Announcement +64)
BNW:
Poland - Confirmed March 15th (Announcement +0)
Brazil - Confirmed March 23rd (Announcement +8)
Assyria - Confirmed March 23rd (Announcement +8)
Zulu - Confirmed April 12th (Announcement +28)
Portugal - Confirmed April 12th (Announcement +28)
Morrocco? - Confirmed April 26th? (Announcement +42)
Civ #7 - Confirmed May 17th? (Announcement +63)
Civ #8 - Confirmed May 17th? (Announcement +63)
Civ #9 - Confirmed May 31st? (Announcement +77)