OpenCart just released their first update, v1.5.6, since January. This update adds a few new payment options which were previously not available in OpenCart. Some of the new options include integration with Amazon Checkout and PayPal Checkout Express.
In addition, they have added the ability to set up and accept recurring payments. This feature is great for retailers who offer products on a subscription basis. Recurring payments will also work with the PayPal Checkout Express module.
OpenCart is one shopping cart that I have been keeping my eyes on. They have been adding features at a pretty decent pace and they are one of the few open source platforms that offer true Multi-Store capabilities. Magento still wins hands down when comparing features, however, OpenCart has plenty of features and a pretty large selection of available add-ons.