From their official statement:

Since we rolled out an updated version of our logo last week on our website, we’ve seen an outpouring of comments from customers and the online community in support of the iconic blue box logo.

Last week, we moved to address the feedback and began exploring how we could tap into all of the passion. Ultimately, we’ve learned just how much energy there is around our brand. All roads were leading us back to the blue box, so we’ve made the decision not to use the new logo on gap.com any further.