I've said it before, and I'll say it again: BUYER BEWARE. Seeed has a nasty habit of pushing "open source" products like these very hard, and then not publishing sufficient documentation and example code. For this specific device, I had bought 3 different kits from their Kickstarter campaign, under the assumption that I'd receive a product that I could really play around with. Unfortunately, that was not the case.
The RePhone core, a MediaTek MT2502A, looks amazing on paper, yet YOU don't get that performance or featureset. Instead, you're stuck with a closed source RTOS blob. No register-level documentation like you'd get with any other open source project. What you get is a Windows-only, Eclipse-only SDK which provides indirect access to some of the features on the chip. So if you wanted to, like me, code in Vim on Ubuntu, you're mostly screwed, or at least your normal workflow is broken.
Now I understand that there are some people who don't mind this, and are happy to put up with this. That's fine, but I'll just warn you that you might not find nearly as many examples as you're hoping for. If you really want to buy this thing, you should consider getting into Lua programming and looking up some of the non-Seeed examples on GitHub.
Maybe I'm whining and acting overly-entitled, but I don't think this deserves the privilege of being called "open source". That's just disingenuous and hurtful to those in the industry who really do create wonderful open source technologies.