It doesn't matter that the Galaxy S2 is much more popluar than the Galaxy Note, or that the Galaxy Note is much more popular than the Galaxy S Advance... What matters (in the OTA updates... thing) is the release date. The Galaxy S Advance is newer, which leads to faster OTA.
Besides... there's the fact that Samsung is trying to port all features from the Galaxy Note 2 over to the original phablet, which requires a lot more work than JB for the Galaxy S2... such as all those S Pen goodies
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And... lastly... let's not forget about the black clipping fix that two Samsung devs confirmed to be in the works (a couple of months ago?). It makes sense for Samsung to delay the update until February, but if it is released then and comes without the black clipping fix, they failed miserably to deliver what they promised.
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Anyway... my expectations are that the JB OTA for the S2 will be released some time between this week and the next one, while the JB OTA for our beloved Notes will be released towards January's end. Most likely it's gonna hit us the first week of February. But then again... that's just my two $0.01.