Colorspec / Color 'none' allowed since 2013a ?

Hello,

in MATLAB Versions < 2013a I receive the following message for this code:

figure(1);
set(figure(1),...
'Color','none')

Warning: Setting the ColorSpec to 'none' for a figure will not be allowed in a future release.

When using the same code in 2013a the warning message disappeared and the background seems to be set to transparent, which works fine.

Was finally decided to allow the Colorspec 'none' or do I have to worry about all my previously written plot tools and routines, which might result in some error message in a future version?