This is not really a new thing. Elite players have been getting custom irons built specifically for their specifications for years. They rarely get marketed for mass sales as they are designed for that one individual. Remember the swoosh TW irons that were basically built off of Tiger's old Titleist blades. Nice that Titleist has labeled these guy's sticks (JT and Adam) for them as it shows Titleist is committed to a relationship that recognizes their contributions to the brand. As for retail availability in some limited form, i guess anything is possible.