Something tells me "3.11" probably isn't even in the works. Did I miss something? Should we be looking forward to a new firmware version any time in the next few months?Your dealer is wrong.
As for people with yellowing artifacts using DI... the solution is simple. If you have the NX7, engage the color filter. If you have the NX5, don't use the DI if the yellowing bothers you.
I have my color filter engaged almost constantly except on desktop content where I leave the DI off anyway (the DI goes nuts opening and closing white and black windows).