thinking it about it from apple's perspective it makes sense why they didn't include the 850m architecture , look they know that a .2ghz refresh is not worth advertising and if they go onto release in a keynote , what are they going to say , " hey um broad well is delayed so we have a .2ghz update " and the 850m in the high end would split there profits , cause honestly if i have a late 2013 mbr with a 750m and you release with the same specs but with an 850m would most people buy it , not really , but if i release a broad well with 850m which increase the value of that laptop i want that device more now so i will update as its a new chip and a new dgpu , there building hype for the broad well update so that mass sells