This info straight from the HMV website, check it out:
Metal Gear Solid creator Hideo Kojima and lead artist for the series, Yoji Shinkawa will be singing pre-release HMV exclusive sleeves of 'Metal Gear Solid 4: Guns Of The Patriots'
hmv 150 oxford street on Monday 2nd June at 12pm*
* Please note that due to time constraints access to meet Mr. Kojima and Mr. Shinkawa will be strictly limited. 300 sleeves will be available from the store on the day of the event from 9.00am.
Access to the queue will be limited to customers with the exclusive sleeve only. Sleeves will be issued upon a five pound deposit being made to pre-order Metal Gear Solid 4: Guns Of The Patriots at HMV. One sleeve per customer only, on a first-come-first-served basis, subject to availability.
[Metal Gear, Kojima via HMV]