"Winamp will remain the owner of the software and will decide on the innovations made in the official version," explains Alexandre Saboundjian, CEO of Winamp."
Which license will be used? "Opening up" is not exactly GPL.
I also don't know what license will be used, but nothing in the GPL prevents [eg] the owners of Winamp continuing to own Winamp, or from deciding what innovations will (or will not) make it to their own official version.
I'm not sure that "opening up" actually means what you may appear to think that it means.
The entirety of present-day Winamp could be released, with code, under the GPL tomorrow and nothing says the org that owns Winamp will somehow cease to own Winamp, or that they must accept others' changes into their own source tree.
(And that's perfectly OK, even under the restrictions of the GPL.)
I'm not sure that "opening up" actually means what you may appear to think that it means.
The entirety of present-day Winamp could be released, with code, under the GPL tomorrow and nothing says the org that owns Winamp will somehow cease to own Winamp, or that they must accept others' changes into their own source tree.
(And that's perfectly OK, even under the restrictions of the GPL.)