If you're already an Xbox Live Gold member then you won't have to sign up again, as the service is unified. The blog also reveals the differences between the silver membership experience and the gold features.
Silver Membership Features:
Single gamertag
Common gamer profile
Common gamerscore
Single player achievements
Private chat via text and voice
Common friends list and online presence
PC only multiplayer including browsing a list of active PC games
Gold Membership Features:
All Silver membership features Plus
Multiplayer matchmaking with friends
TrueSkill matchmaking
Multiplayer achievements
Cross-platform gameplay
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