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Hey there,
I'm developping a Qt 4.4 core GPL licensed program.
I have a commercial Qt license and I'd like to develop closed plugins for my app.
Is there a way for me to support commercial plugins with a GPL core ?
Here is the GPL Faq http://www.gnu.org/licenses/gpl-faq.html#GPLAndPlugins
The best way to do that is to license the plugin API under BSD (or any such license allowed by Qt GPL exception and permissive enough for your needs). The core can embed it without any legal problem and the plugin can use it without any legal problem either.
If you want to be absolutely sure no legal concern can surface use only PURE VIRTUAL class in your plugin API.