I would imagine with the rotations and so on it might take SQ time to apply the decals. I did note a big advertising item in the weekend newspaper here by SQ which *did* have the "A Star Alliance Member" tag that other members have - good to see.
Note that I have not seen a TG a/c with a Star decal lately (the A300 excepted) - almost seems as though they have removed them because they used to have logos all over them.
------------------
UA 1K MEL
A Star Alliance(tm) Member.