According to the information released for the upcoming Tales of Zestiria the X second premiere screening, nurse episodes 5 and 6 of Tales of Zestiria the X will have bits of Tales of Berseria.
When we say episode 5 and 6, case we mean the ones numbered as "Episode #05 and #06." Technically, it will be the 6th and 7th episodes to be aired if you count the Episode #00 prologue.
In the information released for the second pre-screening event, it is mentioned that Tales of Berseria will somehow cross over with these two upcoming episodes.
We've already seen Velvet herself, the protagonist of Tales of Berseria, appear in Tales of Zestiria the X's opening theme. We'll finally find out how exactly she's tied to the story by these episodes.
Episode #05 and #06 of Tales of Zestiria the X will be shown at the upcoming second premiere screening this August 5, 2016 in select theaters in Japan. There will also be a cast and staff talk show, plus an information corner for the Tales of Berseria game. This latter part will be done at Cinema Mediage in Odaiba , and will also be shown as a live viewing in the other cinemas. Participating cinemas include TOHO Cinemas Umeda, TOHO Cinemas Nagoya Bay City, TOHO Cinemas Tenjin, T Joy Riverwalk Kitakyushu and ufotable Cinema. Tickets will be 2,500 Yen if you'll be at the Cinema Mediage one and it will be 2,000 Yen for all the other cinemas.
Included in the cast show are the voice actors of Velvet, Laphicet, Rokurou and Magilou along with the Director and the Producer of the Tales of Zestiria X anime. It will be an event that will make Tales of Zestiria the X and Tales of Berseria "cross" each other.
If we're following the actual release of the episodes in public, Episode #05 and #06 will be shown on August 7th and August 14th, which will be in good timing with the release of Tales of Berseria itself on August 18, 2016 in Japan.