Panasonic 45mm lens in Stock at Amazon DE, amazon UK, amazon FR and PIXMANIA.
The lens is now in Stock at Amazon UK
The same lens is still not in stock at amazon US
UPDATE: The lens is also available in some european pixmania shops. Click here: to check it for yourself.
Read the user review written inside this dpreview forum post.
Two professional reviews has been written by quesabesde (click here for the google english translation) and dpreview.