Yes it's compatible with dp. It's the special edition for the d/p series, like emerald to ruby and sapphire.
you lost me oniko, DP is still fresh in your mind? This is DP, only A LOT better. The elite four is ridiculously harder after the first time you beat them, the battle frontier is mildly entertaining (i beat each brain once and the tower twice). You can fight random gym leaders daily after you beat team galactic where heatran is (This is possibly my favorite change). Zapdos, Articuno, and Moltres become catchable. You can catch the 3 regi if you have special regigigas. You can catch dialga and palkia at level 70. Shaymin and giratina have alternate forms. etc. etc.
If you guys think trading is hard, you aren't abusing the Wi-fi capabilities. I do all of my trading online. My friends actually aren't useful when it comes to trading for rare pokemon/ event pokemon, lol. You can battle online as well oniko, join gamefaqs. Everyone is always looking for battles and trades there.
AND REMEMBER: We're having a pokemon tournament at fanime, so get ready for massive trades/ battles =O