Actually Coindesk has cited that those coins will be auctioned off on 6/27 with the following rules:

"As part of the auction, the Silk Road bitcoins will be divided into two phases for eligible bidders.

The US Marshals Service (USMS) has effectively split the 30,000 BTC into nine blocks of 3,000 BTC and 1 block of 2,656.51306529 BTC, known as “Series A” and “Series B” blocks, respectively.

All interested buyers must register with the US Marshals Service (USMS) in order to be eligible for the auction. Aspiring participants must provide the following to the federal agency:

A $200,000 deposit sent by wire transfer from a bank located in the US
A copy of a government-issued photo ID
A manually signed PDF copy of the bidder registration form."