I agree June is becoming extremely unlikely, but I do still think the next one will be the last one and will be probably in July.
JWE2 had its packs this year on March 13 (hybrids pack) and May 16 (Collection pack) so just over 2 months apart. So if we look at the next couple tuesdays after June 30 ( 2 months directly after the release of Barnyard) we're at a release of the 2nd or the 9th of July. Of course this doesn't confirm anything since they are 2 different games, but lets face it both are ending support, ones already extinct (I'm so funny

) I really think their plan is to wrap up both games in the first half of the year then focus on the new game in the second half. Why they haven't announced the new game yet is strange to me though, games fest would've been the perfect way to announce it at least imo.