Google was expected to bring some additional shipping options to the Play Store and as of today, it looks like they have come available for new purchases. All together there are three options available for shipping, however not every item will be eligible for every shipping option. Any and all eligible shipping options will be presented during the checkout process.
Google lists the three options as Saver, Ground and UPS two-day. The Saver option will take 5-10 business days for delivery, the Ground option will take 3-5 business days for delivery and the two-day option is, well, two business days. The one point that you will need to remember up front -- regardless of which option you choose, Google still needs 2 business days to process the order.
Simply put, even with the two-day delivery option, you may still be waiting up to 4 business days before your package arrives. While a quicker processing time would have been nicer to see, we suppose waiting 4 business days is better as compared to upwards of 12 business days.
It basically just comes down to how much you are willing to spend on shipping and how long you are willing to wait for your package to arrive. Otherwise, the 2-day option should be available for all products and the Ground option will be available for many products. The Saver option is the one that is less likely to be seen and applies mostly to the smaller accessories.