I just got some new info that might be of some interest:

EE Patch:
TWEE_Upgrade.exe 930 MB

Adventures:
TWEE_adventure_Side_Effect.exe 301 MB
TWEE_adventure_The_Price_of_Neutrality.exe 320 MB

Language packs: (~400-600MB)

TWEE_Czech_language_pack.exe 523 MB
TWEE_English_language_pack.exe 472 MB
TWEE_France_language_pack.exe 461 MB
TWEE_German_language_pack.exe 573 MB
TWEE_Hungarian_language_pack.exe 563 MB
TWEE_Italian_language_pack.exe 542 MB
TWEE_Polish_language_pack.exe 605 MB
TWEE_Russian_language_pack.exe 674 MB
TWEE_Spanish_language_pack.exe 446 MB



No word on exact sizes of the extra content yet, but from what is known, the overall maximum download (i.e. if you download everything) will be 9GB, minimum recommended will be 2 GB (Patch, Main language version, 2 adventures).

Oh, and old saves can be continued in the EE contrary to previous reports.