In an effort to offset sluggish sales in its traditional vehicle segments, BMW is planning more niche models like the X6 and the upcoming Progressive Activity Sedan that will hit the market in 2009. According to a BMW spokesman, the company is working on a derivative of the next 3-series.A 3-Series derivative could allow the assembly plant to operate more profitably, said the spokesman. Currently the plant only builds 1,000 3-Series sedan and wagon models. A new plant could help BMW make up for the falling demand in those two segments.BMW is planning a similar strategy for the new 5-Series. Let’s just hope these models don’t turn out to be another X6.