I happened to be near Kinokuniya yesterday when I received a call from the Japanese book counter telling me that my Negima! Vol.15 was ready for collection.
The limited edition is waaaay overpriced but I bought it anyway because I am a tool of the system. It comes with a DVD that contains promotional material for the new Negima! OVA.
After watching the DVD, I am happy to say that the new Negima! OVA is better than I expected. The character designs are surprisingly close to the original and the animation quality and detail are a few hundred times better than the horror that was the TV series. A few hundred being a modest estimate. The entire cast is retained as far as I can tell. The OVA also seems to contain a little more fanservice… Well, still far less than the manga.
One complaint: The OP “Yume Minna de” is not as catchy as “Happy Material”.