According to various Japanese newspapers X JAPAN will play at the Lollapalooza festival on the last day, which is the 8th of August. In his interview at the ACen festival on the 15th YOSHIKI also mentioned that they'll play on one of the main stages as the next to the last act. There will be a totally new song performed at the festival, named "Born to be Free", for which they'll start shooting a music video abroad (outside of Japan, presumably in the US) next month.

The Yokohama Nissan stadium concerts that were announced earlier this month are scheduled for 14th and 15th of August, the weekend after the Lollapalooza preformance.

Sources: Sanspo, Barks, etc