Their super-detachment is as normal, 1-6 Core, 1+ Auxiliary, 0-3(?) Command. You can't have more than one Patriarch, Magus and Primus in the Cult Insurrection detachment (super detachment) which is a bummer. Patriarch gets a codex warlord trait re-roll, all non-vehicle units gets Infiltrate, if they already have Infiltrate then they get Shrouded for the first game turn, you add 1 to reserve rolls and enemies subtract 1 from reserve rolls. All units that arrive from ongoing reserves gain D6 models back that were killed earlier in the game.
The two Core formations are very different; one has most of the units in the codex, the other is Neophyte Hybrids and the IG tanks - mandatory Leman Russ squadron and Sentinel squadrons.
THE STATS FOR THE MODELS HAVE CHANGED SINCE DEATHWATCH OVERKILL!
The Patriarch is now 90 points but is Strength 6, starts off as a ML1 psyker but can buy ML2, can buy two Familiars on the cheap and gets access to Biomancy, Broodmind and Telepathy. He also confers Fearless to all friendly Genestealer Cult units within 12". Yikes!
The Magus is 40, comes with Adamantium Will and Infiltrate now, is ML1 base but can pay for ML2 and gets the same disciplines as the Patriarch, he also gives Adamantium Will to all Genestealer Cult units within 12". Yikesx2!
Chimera and Sentinel data-shoots look identical to the Astra Militarum versions, still BS3.
Goliath rules confirmed per Tyranid607, the normal Goliath is an open-topped transport!
The First Curse formation does the following; 1 Patriarch, 1 Purestrain Genestealer unit, you roll a D6 before the start of the game and add the result to the Purestrain Genestealers for the whole game; 1: they get assault grenades, 2: they get 4+ armor, 3: they get Poisoned melee attacks, 4: they get Rage, 5: they get Preferred Enemy, 6: you pick which one you want.
That small Core formation I mentioned earlier with the Neophytes and IG tanks does the following; Neophytes have to take Chimeras as DTs, all vehicles get Outflank and the Scout Sentinels get Cult Ambush (this works with that restore D6 models rule in the Cult Insurrection detachment???), ignores stunned and shaken on a 4+.
They also show the profiles at the back (meaning stats only) here's what we got;
Acolyte Iconward; basically a Primus but only 2 wounds and LD9. Primus; now has WS5 and 3 Wounds. The stats for Acolytes and Neophytes remain the same, they now have unit leaders with +1 Leadership and Attacks. Weapon Teams for Neophytes are in and are the same as IG except for +1 Initiative and LD just like the actual Neophytes. Metamorphs look to have the same stats as Acolyte Hybrids but are Elites, presumably they will have extra special rules and nastier weapons. Purestrain Genestealers look to have 3 attacks base now but are otherwise the same.
The weapons list confirms that the Leman Russ variants in the standard Leman Russ kit are the only ones available. The Clearance Incinerator is a S5 AP4 Torrent Template weapon. The Heavy Mining Laser is just a Mining Laser with 36" range. The Heavy Seismic Cannon is either Heavy 3(or 2?) and S8 AP3 at 0-12", or S5(?) AP4 Heavy 6 at 12-24", and both have the "Resonance" or something akin to that special rule. Normal Seismic Cannon is the same, just with one less shot in the first profile and two less shots in the second profile. The Webber weapons fire blasts and are S3 (pistol) and S4 (rifle), they also have some over special rule that looks to be different to the one the Seismic Cannons have. The Rock Cutter, Rock Drill and Rock Saw are all basically power fists, the cutter has some special rule I can't make out (maybe Shred?), the drill has "Pulverize", the saw has Armorbane, all of them are two-handed. Metamorph weapons now, they are all S: user but have different special rules, it looks like at least one of them is AP3 and their special rules seem to be unique/new. There's also something called a Power xxx or something that is Unwieldy, Two Handed, AP2, I can't make out the strength and has a few special rules.