N0NECZ:
Steamworks features include:
Steam Achievements
Big Picture
Steam Cloud
Trading cards for Asylum and City Goty and accommodating shit.
Additionally, this stuff happened:
Games for Windows Live and Securom has been removed.
Region restrictions for Arkham City have been lifted.
Everyone subscribed to the standard edition of Arkham City now have a free Goty version in their library.
Unfortunately your save files may not work anymore.
Both games are for 75% off for the weekend.