How often does Wilson come up with new PS racquets?

[namja]

For 2012, Wilson came out with the new Pro Staff BLX Six.One (white "Federer" racquet). How often does Wilson update their racquets? Is there a place I can go to see the history of the Pro Staff 6.1 series and their release dates?

 

[darklore009]

Wilson usually updates their racket every 2 years. Since it release this year, most likely to be out in 2014