We shall see if they are offered in Lefty since Mickelson plays them...Nevertheless they are coming.
Source: Callaway Golf on Facebook
There are some pics in this thread from when we visited Callaway
From the press release
Available in three lofts (18, 21, 24 degrees), the Callaway X Utility Prototype Irons are made with a hollow forged construction of 1020 carbon steel, a tungsten sole to precisely dial-in the CG location, and a high-strength maraging steel face that promotes highball speeds. Each iron also features removable weights on the sole that range from two to eight grams in two-gram increments that allow players to make swingweight adjustments to fit individual needs surrounding specific length, shaft and grip options. Callaway’s X Utility Prototype Irons will feature a new product introduction retail price of $199/steel and $229 withgraphite shafts.
“I didn’t expect the [PGA Tour] players to gravitate much towards the 24-degree version,” added Roger Cleveland, Callaway’s Chief Designer. “I thought that loft would more address the needs of the Champions Tour, LPGA and skilled amateur golfers, but the guys on the PGA Tour put them right into play. Ernie Els immediately adopted all three and asked, ‘Where is the rest of the set?’”
Have they announced the stock shafts yet? I'm really hoping they don't mess that up. Something like a KBS hybrid as a stock option would be refreshing to see. I'm guessing, knowing Callaway, they'll screw us over on the stock shaft. Given it's supposed to be a "players" model, it would be nice to get an aftermarket shaft.