The official VIZ website has recently launch with news that the series will be streamed online and offered for download. There is also surprisingly a DVD section, but with no news on a release date yet. However, given that NANA has been recently solicited an announcement surely is imminent.
Also worth noting is that the trailer utilizes music that was NOT part of the original score, suggesting that maybe
VIZ didn't snag the rights to the entire soundtrack (the OP seems to be intact though). I know the music is a big selling point for fans...this may actually stifle a few from purchasing the anime.
Anyway check it out: