The developer of the TinyUmbrella utility that allows you to save SHSH certificates on your computer, has just announced a new program called TinyPwn that will allow you to customize the firmware for iPad by using a simple API.
We know very little regarding TinyPwn, although we can assume that it will be a program much like Pwnage Tool and sn0wbreezeoris a tool that will create a custom firmware restore through iTunes on the device.
Even if you still do not know the release date of TinyPwn, the developer has announced that this tool will be compatible with Mac, Windows and Linux, and that, along with the edited files. ipsw, will be introduced in other important news.
As soon as we have more information you will communicate.