If they were still open for business as of last year I'd wager they didn't close up after all, but yeah, I'd keep an eye.
You've already got Jack for that, I guess. And yeah, if you're in Campos de Jordão for the chocolate, you're definitely in there for the right reasons. And, well, most places in the country are just hot and rainy year-round, but if you're thinking of beaches specifically: northeastern beaches are very rainy in autumn and winter months (Southern Hemisphere autumn and winter, so, March to September), and they're least rainy from October to December; southeastern beaches, on the other hand, get the worst of rainfall in the summer months (which has led many hilariously ill-advised summer trips to the path of sheer ruin) -- it might seem strange going to beach in the winter, but I've been a couple times, and it actually works since the weather's not much colder unless you happen to run into a cold front and there's much less rain and crowds to contend with. And speaking of crowds, I guess all I can really say about them is, if there's a southeastern beach that everyone's talking about in a given year, avoid that beach like it's the plague. And also, a lot of people here like to go the beach for New Year's Eve, so, unless you're interested in seeing the festivities/unmentionable chaos, save yourself. Oh, and, mentioning the festivities reminds me, if you're any interested in the Carnaval, it's usually happening sometime in February or March -- and also, it's not really my cup of tea, so I don't have much more information about it.
(No, that's an awful idea. If all your luggage is full of dulce de leche, where would you pack the brigadeiro?)