Whatever Samsung plans to announce next month in Barcelona, Samsung hast just sent out its invitation for its upcoming Mobile World Congress press conference and has just relaunched its "unpacked site" which this time teases that "Something big is coming". The preview teaser shows last year's launched Samsung Galaxy S and a yet hidden device on the right. It can be expected that it will be something different, most likely the "Samsung Galaxy S II" (or whatever Samsung will call it) and I would expect that it is an Android device. However, I wouldn't expect that it will be the Samsung's version of the Google Nexus S, the GT-I9003, even if the launch should be close as well.
In any case, the::unwired will be on site and Samsung has promised that the preview teaser will starts February 1st.
Cheers ~ Arne