I do not think LM will be squatted, but I will pontificate on my dream list for fun. Without factoring unknown 9th ed meta changes.
Army Special Rules
Slann restrain predatory fighters the same way Skinks do. I don't care whether PF applies to supporting ranks or not but it should be CRYSTAL clear. I think Terradon and Ripper chiefs should be able to join their respective units.
Core
Saurus one point cheaper. Include options for spear and shield, hand weapon and shield, additional hand weapon all for the same cost. Option to take 1-3 point Marks of the Old One. One per unit.
Skink Cohorts, unchanged
Skink Skirmishers, may take javelins, short bows, or blowpipes. Shields cost one point per model and may be combined with blowpipes or javelins. Short bow are poisoned too.
One Cohort or Saurus Warrior block per army can take a 25 point magic banner.
Special
Temple Guard, unchanged
Jungle Swarms, 8 points cheaper per base
Chameleon Skinks, unchanged but for 10 points per Chameleon Skink unit, you can add one more blot toad to the enemy army
Cold One Riders, 2 points cheaper per model. May take magic banners up to 50 points
Kroxigor, may take full command crews.
Terradons, make Fireleeches free just for simpicity
Bastiladon, cost 15 points cheaper. Solar Engine costs 15 points, Ark of Sotek costs nothing.
Rippers, unchanged
Stegadons, unchanged
Add Horned One Riders
Horned One Riders
M WS BS S T W I A Ld
Skink Rider As Skinks but with T3
War Party Leader As above with +1 A
Horned One M8 WS3 BS0 S4 T4 W1 I3 A2 Ld5
Unit Size 5+
Skinks: Aquatic (NA) Scaly Skin 6+, Cold Blooded
Horned Ones: Fear, Fast Cavalry, Cold Blooded
Hand Weapons, Shields, Spears
22 points Each
War Party Leader: 10 points
Musician: 10 points
Standard Bearer: 10 points.
One unit of Horned One Riders may take a magic Standard worth up to 25 points
May Take one of the following:
Lustrian Javelins: 2 points
Lustrian Short Bows: 2 points
Lurkerdons, Monstrous Cavalry trained from river predators, approximately the same size as Demigryphons or Juggernauts of Khorne
Skink Rider As with Horned One Riders
War Party Leader As above with +1 A
Lurkerdon M6, WS3, BS0, S5, T5, I3, W3 A3 , Ld5
Unit Size 3+
50 points Each
War Party Leader: 10 points
Musician: 10 points
Standard Bearer: 10 points.
May take a magic Banner worth up to 50 points.
Shields, spears
Skinks: Coldblooded, Scaly Skin 6+ Aquatic
Lurkerdon: Fear, Swiftstride, Aquatic, Sea Creature, Predatory Fighter, Cold Blooded, +2 additional armor save to riders
Rare
Salamanders and Razordons unchanged
Ancient Stegadon, unchanged
Savage Saurus Warriors, 14 points each, As Saurus Warriors with +1 WS, +1I, +1 Ld, light armor (or just more scaly skin), and Frenzy, may take up to two marks of the gods, may take Halberds for one point or great weapons for two points.
Troglodons, 20 points cheaper
I would add a stationary version of the Stegadon's giant bow for 35 points with a two Skink crew. There would be a Special Character that can make the shots magical and more accurate.
Characters
Slann can restrain PF just like a Skink character can
Skink Priests take Beasts or Heavens OR whatever lore the Slann has if the player chooses except for High Magic.
Saurus may take Heavy armor
Skinks get more options. A Skink can take a short bow, blowpipe, or javelins AND this does not preclude taking a spear or additional hand weapon.
I would introduce a new batch of special characters narcissistically based on my own fuff pieces. Because I like having my characters die, I would introduce a LM tradition of namesakes for the dead, so there could be lots of Kaitars (all dying nobly).