Poly balls will be approved for tournament play from 1 July 2014.
ITTF Approved Poly balls, or rather labeled ITTF 40+ Approved balls are already available in the market, but not approved for tournament usages yet.
Only certain world tournaments after 1 July 2014 will use poly balls - as listed and explained by ITTF.
Regarding supply, it will be in mass delivery from early June.
Besides those tournaments named by ITTF, national federation can decide which ITTF approved ball (40 or 40+ meaning cellu or poly ball) to use.
IE French and Chinese leage will use cellu ball. German league will use poly ball.
Now for the rest of us amateur players, there is no rush to move over - unless you want the new ball to practice because you are going to a poly ball tournament.
Until ITTF takes off the current cellu ball from the aprove ball list, there are perfect legal and will still be available for purchase and use.
All of the above information has been shared by ITTF few weeks ago already, and general knowledge
Suprised that lots of people didn't see it....
Other than that, I am the likely the first person in South Africa or Africa to have the poly balls - I got mine in Feb 2013.
Since then, many countries are already using them and some retails in Asia have already sold them.
Sadly the retail versions are mostly the defects so it will break easily or egg shape.
The better ones (limited) is given to juniors teams or provincial teams around China and Taiwan - thats as far as I know.
I personally feel that it will take lots of countries 1 to 2 years to migrate over.