Why is this Haggadah different from other Haggadot? As there are four questions, four sons, and four cups of grape juice/wine in the Haggadah itself, I will give four answers:
1 - It is Messianic. i.e. It is intended to celebrate the life of Yeshua (Jesus) the Messiah and to tie the Seder in to familiar Christian traditions, e.g.: Communion.
2 - It is presented in a way to be understandable by those not familiar with the Seder. Only the blessings and one song are in Hebrew and they are both translated into English and transliterated (Hebrew pronunciation spelled out in English letters). If you wish to forgo the Hebrew altogether, that is perfectly fine.
3 - While being complete (all 14 steps are here), it has been pared down to save time and avoid confusion. In traditional Haggadot, there are many long rabbinical quotes and readings, often in Hebrew. These have been deleted, along with multiple sets of instructions pertaining to what day of the week the seder falls on.
4 - While most Haggadot are distributed only in printed booklet format, this one is being distributed primarily in electronic format.