Markit have launched their solution to managing trading limits in the new SEF based execution environment. There's no additional information to describe the solution unfortunately.

• Video with Jeff Gooch describing the Hub here.
• For more on Push, Ping, Hub, see this article at Risk: here (subs)

A longer explanation of these three models will appear in a forthcoming book by David Murphy over here, with a chapter by myself on this and other topics. Press Release.