What will be Ajmal's new 'mystery' delivery? A knuckleball?

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I read that Saeed Ajmal will unveil a new 'mystery' delivery against England in the UAE test series. What could it be?

Since Ajmal is too shrewd to mess with his beautifully-honed action - which is making him into the best world spinner, overtaking Swann - and knowing the method of his stock deliveries

http://the-doosra.blogspot.com/2011/07/how-does-saeed-ajmal-bowl-his-doosra.html

i.e. ball held between middle and ring finger, spin imparted by a forward flip (extension) of the wrist with the back of hand facing batter...

Then I can make a guess that the mystery delivery will be a straight, floating, wobbling ball with no spin at all (thereby creating turbulence and unpredictable movement, like a baseball pitcher's knuckleball) - and he will deliver this simply by not flipping the wrist forward and instead releasing the ball completely dead, seam sideways to the batter.

It's just a guess - and it will be interesting to see if my prediction is correct.

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