^Uhhh, one 'Karp LZed still lets the Gyara to 80 with an E-Belt, which means it would still 2HKO the Gengar. It's a pretty even matchup, maybe in favor of LostGar, but it's definitely not an autoloss for Gyara.
LuxChomp will still be far and away the most popular deck. LostGar will be big, but I think LuxChomp will be the BDIF for at least another couple of months.
The meta for states will probably be about the same as it has been besides LostGar and possibly some counters. No reason for it to change dramatically between now and then.