I've missed the Laketown Guard all together... When did that even come out? Never saw a mention here of it.
Apparently it started having availability in Toys R Us stores in December. I never saw it myself, I see it on eBay - it is the exact same mini fig as the one that comes with the Lake-town Chase set (according to Brickset.com) - here's details on the set - http://www.brickset.com/detail/?Set=30216-1 - seems like a neat way to add to the Lake-town Guardsmen.
My guess is that once Toys R Us finishes their annual inventory - we'll start to see it show up a bit more at the stores.
When I ordered the Barrel Escape set I saw that it was in-stock and the website indicated also in-stock at the store I was going to pick up the other set from so I threw it into my shopping cart - shortly after the order, I got notified that they actually DIDN'T have it in stock and it was removed from my order. So my thinking is that in the TRU computer system a box of these is scheduled for delivery to that store and the only thing holding is back is annual inventory.