ETA: You can see the new Muguet 2011 below (pic kindly provided by my reader Rappleya)
ETA2: Upon further research, Guerlain has confirmed that they have updated the design of Muguet 2011 with the one depicted second from top, favouring a sewn label versus handpainting. I admit I'm not particularly enthusiastic on it after seeing the previous design....
3/26/11 update: My faithful and wonderfully generous reader Judy informs us of the latest after seeing the Muguet 2011 with her very own eyes and I quote:
"The new release of Muguet is around 5 ounces, twice the size of the past releases [ed.note: this was amended by other witnesses, bringing the volume down]. Also it is in apothecary-style container, first shown on your site as the new-release bottle , but w/minor changes. The bottle still has the pretty muguet design on the outside. Also, the price is scary, sky-high, around $500, although Bergdorfs is having a "Beauty Week" beginning April 6th, and at that price, if the customer does a pre-sale, the sales person will hold the Muguet til May 1st for the $100 discount."
Previously Muguet circulated in the standard quadrilobe with (2009) or without the superimposed atomiser "pouf" (2007) and the flacon fleuri design brough back from 1900 for the Eau de Toilette version for 1999, while the accompanying Eau de Toilette tester of the same year was embottled in the classsic Habit de Fete gold-cutouts style flacon with Millesime 1999 embossed on it. You can find pictures of those attached below.
The concentration for 2011's Muguet is Eau de Parfum and the volume is 125ml for 400 euros.
Previous incarnations of Guerlain Muguet include the following:
Guerlain Muguet flacon (Verrerie Royale de Romesnil) with atomiser for 2009
Guerlain Muguet quadrilobe flacon (Verrerie Royale de Romesnil) for 2007
Guerlain Muguet in flacon fleuri (originally 1900 design) for Eau de Toilette in 1999
"Habit de Fete" design for Guerlain Muguet, 50ml Eau de Toilette tester bottle, 1999
thanks to Wim Janssens and Mr.Guerlain (Ulrik) and especially my readers Rappleya and Judy who helped disentangle this mess!