I already mentioned that back in August: Leica Camera will increase their prices on M lenses in the US starting January 1st, 2012. For example, the 50mm f/1.4 Summilux will go up from $3695.00 to $3995.00, the 50mm f/0.95 Noctilux will go from $10495.00 to $10995.00. Prices of cameras and accessories will stay the same. If you need a new M lens, try to get it before the end of the year.
This is not really a surprise since Leica has been raising their prices in the last few years.
Update: the new price list can be found here.