No way of knowing how many of these will be graded 70, but it will not be many based on what we've seen! We had three coins a while back graded SP70, and all sold instantly.
This is the just released "Vapor Blasted" Finish Grand Canyon 5 oz Silver ATB. These coins are specially treated after striking to give them a very attractive matte finish across the entire coin. These are the collector edition coins and bear a 'P' mintmark, not to be confused with the bullion issues that were released late last year. The mintage for this coin is limited to a maximum of 27,000.