Bonky dumped a version of Street Fighter II World Warrior that has rom labels identical to the final 920312 but it boots as 911210. Shoutime got a World Warrior that also boots as 911210 and with similar L letter revisions on the program roms but with a couple of slight differences. So it appears that near the end of the life cycle of World Warrior, Capcom started caring less and less about updating the boot screen date and giving sets their own rom label revisions. Either way there are new sets coming soon to mame.
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DU: Capcom laziness at the end of World Warrior's life cycle