In Japan though
If you own a Vita and have access to the Japanese storefront, get ready to download the Phantasy Star Nova demo within the next month. According to Sega, the demo will drop in August, and will feature a giant boss fight as well as some exploration sections.
If you're anywhere near the Sapporo Convention center or Port Messe in Japan you can attend the Phantasy Star event on July 26th and August 3rd respectively, which will have the demo on site.
Phantasy Star Nova [Sega.jp]