YES it is true. I work at starbucks, and the drinks aren't the only thing to be careful about.. the pastries are dangerous too. The classic coffee cake has over 700 calories!! And most others are around the 400-600 calorie range (basically all sugar and fat). But they do have fruit cups and some other options in the refridgerated section -- go for those, but check out the nutrition facts!! If you wonder about other drinks, just ask a barista, someone should know the info.
P.S. you can always ask for a "short" size. It is 8oz. and I find it to be just the perfect size. A short nonfat no-whip mocha has only 130 calories. mmm Cheaper too!