Yes, getting a offical saying on this would be the best. But Looking at the manual again just now, we found this.
Quote:
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<R08.s>Visible light LEDs with their connected electronic circuits are allowed. Power for the LEDs may be provided by the main robot battery pack (TETRIX or MATRIX) or by no more than one (1) battery of any type not to exceed 9 volts. LEDs used as visual cues must be controlled via connections to a HiTechnic SuperPro Prototype Board or the NXT Prototype Board.
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So in one thing it says that it can be powered by the robot battery OR a 9 volt, and then below, the "functioning" leds.
So yes, it seems like this year, the Option 2 and 3 I listed would be "out of code," for this year.