Pretty sure it's the old formula and they are trying to get rid of stock. I have the new formula and it works great. I haven't used it a lot, but I noticed that it works a little better (stronger) ... the old formula is still a great product, so I wouldn't worry if it's the old or new.
ADS had a sale as soon as the new formula was announced to clear out their old stock. This should be new formula.
Seems to have more cleaning power. I was pleased with the effectiveness of the former product so I use the new at reduced dilutions for the same but more cost effective results. TL