Hard to say right now. So far most major tournaments have been won by "meta gambling list", like pheaver R2+C3PO Han who bet against finding tons of other gunner's Han in a phantom heavy environment or Turchiano, reigning Italian champion, who brought a Dash and Miranda sure to not find many Soontirs in the earliest day of Wave 7 meta.
Right now there's surely a top dog: 4 TLT Ys is a threat that anyone must be ready to face and it's also the list against which you should gamble, but compared to past year meta, which was dominated by Whisper and Han Solo, and, to a lesser degree, regional meta which saw the rise of the DeciFell, the Warthogs and the Brobots while also not scoring out some mixed rebel lists, right now is way harder to list against 4 TLT while keeping a well rounded list capable of dealing with ease all the different stuff that you can face in a 7 rounds swiss turn.
What does well against 4 TLT Ys and can still **** on powerful lists?
Dash seems fine, actually right now is almost a golden age for him: less boosting han solo around, good matchup vs swarms and he has also one of the best matchup of any other big ship, maybe exluding IGs, against TLTs.
Superdash could be coupled with either Corran or Miranda and does more than fine. Lone Wolf R2 could go with anyone but Corran, and if you sacrifice something, he could even be flown with 2 Ys TLT (or 2 hawks without sacrificing much)
However the good old outrider still keep his range 1 weakness, a weakness in common with TLT users and which will see resurgeance of Soontirs and boosting Vader to exploit.
The Decifell of old now has a new toy in the box: you could fit a Palpatine Kenkirk with either Soontir (for more defense) or prockets predator EU Vader (for much more offense).
Kenkirk+Ace list doesn't have a easy matchup vs 4 TLT Ys, but it is not impossible like many are claiming. It surely require good flying and a bit of luck, but both of these aren't anything new to DeciFell or DeciVader players: flying 3 green dice ships always involved luck into their winning strategies.
TIE swarms seems to be back, but I'm not entirly sold about them. While they seems fine vs TLT Ys, Dash Rendar is still too present on the tables for their like, but I have to admit that most of my skepticism comes from them not being present almost at all in my local meta nor I had the chance to witness them in any of the major tournament I went to.
More than full TIEs swarm, I beleive that Soontir+5 Obsidian might be very strong right now, with soontir able to deal against Dash and the swarm providing the needed firepower.
Brobots. Well, before italian national I was selling them as the best list for the current meta: their only weaknesses were rebelcaptive who seems to be less omnipresent right now that Decimators need to make room for the Emperor and the fact they require higher skill than most other lists to be flown with effectiveness. Then the MoV change striked and I'm less sure about them. I also thought that their 3 green+autothruster+boost were more than enought to deal with Ys, but I've witnessed TLTs utterly destroy the poor BroBots: fickle green dice are always fickle after all.
They could use Sensor Jammer but while this will help versus TLTs, it might screw them in other matchups.
Those lists are probably the ones more able to pass the swiss, but there are plenty of other strong combinations.
Warthogs for example are still good and do fine vs TLT y, 3 imperial aces (or 2 aces + 1 lambda) are still a threat, especially for Dash, Han Solo is far from gone, 3 AC advanced+Vader is a reality and the new MoV might see the return of the dreaded BBBBZ.
By myself I'm enjoying the meta: it's a great time for experimentation and creativity!