We came across this kickstarter campaign that features a multifunction SSD shield for Raspberry Pi 2. The shield includes SSD, WiFi, RTC w/Battery and high power USB:
Pi 2 Design is excited to introduce the first offering in a new line of Embedded and Media-based I/O shields for the popular Raspberry Pi 2. The CSB502SSD Multi-Function Solid State Drive shield allows users to create a low cost, high performance, embedded network storage device. The powerful combination of the CSB502SSD and the Raspberry Pi 2 lets you leverage the ever expanding RPi 2 ecosystem for a wide variety of Embedded, Data Storage, Medical and Industrial applications.
Multi-Function SSD Shield for the Raspberry Pi 2 – [Link]