For anyone who cares regarding the new leather, this is what I have surmised from buying and returning so many Paddingtons:
When the first batch of SS06 bags hit the stores in late 05, they had a 6 digit serial number like the previous seasons. These bags (aka my Whiskey and Noir) have soft, pebbly, slouchy leather. The next batch that hit around the late January/early February 06 time frame have the 10 digit serial number and stiffer/less textured leather (texture varies). These bags also have a stiffer inside lining which makes for a more stable base - they sit up taller.
I concluded these findings from the second Whiskey I bought and returned to BG online, the new chocolate which I still have from Nordstrom, and the Noir I just returned. All came out around the same time, have the 10 digit s/n, stiffer/less textured leather, and thicker inside lining. The Noir I kept with the 6 digit s/n must have been a return even though I just got it last week. That NM doesn't even carry Chloe, so a customer probably returned it there instead of the store it was purchased from.
Who is gonna run and check their bags to prove my theory wrong?