2.5 L standard on Touring and Grand Touring, loses only 1 mpg to the 2.0 L. I needed the SUV in December, but if I had known this I might have waited till January. If the price stays the same, everybody who bought a Touring or Grand Touring just took a big hit to their resale. Not to mention the horsepower and the torque deficit.
I wouldn't worry about it, prices for new 2.5L Tourings and GT's will be higher. (They have already increased pricing about $400 for GT's in 2013 since Feb/March launch)
And since the CX-5's mainly sold for their attractive price/size/MPG/style, those attributes do not change with either engine. The 2.5L still is modestly powered compared to 2.0L turbo Escape.