A "sneaky move" refers to a stealthy or secretive action, usually done to gain an advantage over someone or something. It implies a cunning or deceitful behavior. Full definition
This is a very sneaky move on Amazon's part — they had a disagreement with Apple, who want 33 % of the money for any book sold through the Kindle application on the iPad, so they've just made Kindle available for Safari (the browser that comes with iOS devices, I believe), with settings that are «optimised for iPad screens». (andrewhickey.info)
Delta quietly boosts prices of SkyMiles business class awards: Yet another unannounced sneaky move (travelskills.com)
It seems that the calendar has pulled one of its oh - so - sneaky moves on me. (scientificamerican.com)